# Performance Marketing Glossary

39 plain-English definitions of Google Ads, SEO/AEO, CRO and analytics terms, maintained by MyLeadsFactory (https://myleadsfactory.com).

Canonical: https://myleadsfactory.com/glossary
Each term also has its own page and markdown mirror: https://myleadsfactory.com/glossary/<slug> and https://myleadsfactory.com/glossary/<slug>.md

## Performance Max

Performance Max (PMax) is Google Ads' automated campaign type that uses Google's AI to serve ads across Search, Display, YouTube, Gmail, Discover, and Maps from a single campaign. It requires the advertiser to upload creative assets and conversion goals; Google's algorithm handles bidding, audience targeting, and placement selection automatically.

Common misconception: PMax does NOT 'do everything for you'; it requires high-quality asset variety (15+ images, 5+ videos, 5+ headlines), an accurate conversion-value signal, and audience signals to perform. Accounts that upload one logo + one headline see noise-level results.

Source: [Google Ads: About Performance Max](https://support.google.com/google-ads/answer/10724817)

## Smart Bidding

Smart Bidding is Google Ads' machine-learning bidding system that automatically sets per-auction bids to optimize for a chosen conversion goal. It uses signals like device, location, time of day, audience, and historical conversion data to predict the probability and value of a conversion for every auction.

Common misconception: Smart Bidding doesn't 'find' new customers, it predicts which existing auction-winners are most likely to convert at your target cost. It optimizes what you feed it. Feed it form-fills, it bids on form-fillers. Feed it revenue, it bids on revenue.

Source: [Google Ads: About Smart Bidding](https://support.google.com/google-ads/answer/7065882)

## Offline Conversions

Offline conversions are post-click events (calls, demos attended, deals closed) imported back into Google Ads from a CRM or call-tracking system. They let Smart Bidding optimize for downstream business value: closed-won revenue and qualified pipeline, instead of form-fills that may never convert.

Common misconception: Many accounts call form-fill imports 'offline conversions'; they're not. Form-fills happen on the website (online). True offline conversions are sales-stage transitions or call outcomes that happen AFTER the user leaves the site.

Source: [Google Ads: About offline conversion tracking](https://support.google.com/google-ads/answer/2998031)

## Answer Engine Optimization (AEO)

Answer Engine Optimization (AEO) is the practice of structuring content to be cited as a source in AI-generated answers from ChatGPT, Perplexity, Claude, Gemini, Microsoft Copilot, and Google AI Overviews. Unlike traditional SEO which optimizes for ranking position, AEO optimizes for being quoted within an AI's answer with attribution.

Common misconception: AEO isn't 'separate from SEO'; the same content investments produce both. The Google AI Overviews surface uses the same ranking system as classic Google Search. The shift is in HOW content is consumed (cited inside an answer vs. clicked through a SERP listing), not in fundamental signals.

Source: [Princeton: GEO: Generative Engine Optimization](https://arxiv.org/abs/2311.09735)

## Generative Engine Optimization (GEO)

Generative Engine Optimization (GEO) is the academic term for optimizing content visibility within large language model generated responses, introduced in a 2024 Princeton-led research paper. In practice, GEO and Answer Engine Optimization (AEO) refer to the same discipline, though GEO is more commonly used in research contexts.

Common misconception: GEO doesn't require writing content separately 'for AI.' Google's official position is that writing content for AI risks violating the scaled content abuse policy. The same well-structured, well-sourced human-readable content satisfies both SERP ranking AND AI citation systems.

Source: [Princeton: GEO: Generative Engine Optimization (arXiv)](https://arxiv.org/abs/2311.09735)

## E-E-A-T

E-E-A-T stands for Experience, Expertise, Authoritativeness, and Trustworthiness, Google's framework for evaluating content quality, codified in its Search Quality Rater Guidelines. The first 'E' (Experience) was added in December 2022 to specifically reward first-hand experience over second-hand summary.

Common misconception: E-E-A-T isn't a ranking factor in the algorithmic sense; there's no E-E-A-T score in Google's index. It's a framework human raters use to evaluate sample SERPs, which feeds back into algorithm tuning. Pages that rank well on E-E-A-T heuristics indirectly rank better over time.

Source: [Google: Search Quality Rater Guidelines (PDF)](https://services.google.com/fh/files/misc/hsw-sqrg.pdf)

## llms.txt

llms.txt is a proposed standard (analogous to robots.txt) for a markdown file at a website's root that gives large language models a structured summary of the site's content and key pages. The proposal was introduced by Jeremy Howard in September 2024 at llmstxt.org.

Common misconception: llms.txt is NOT a way to prevent LLMs from crawling your site, that's robots.txt with bot-specific disallow rules (GPTBot, ClaudeBot, PerplexityBot, etc.). llms.txt is the opposite: it INVITES LLMs to consume a structured summary.

Source: [llmstxt.org: The /llms.txt proposal](https://llmstxt.org/)

## IndexNow

IndexNow is an open-source protocol that lets websites instantly notify search engines when content is added, updated, or deleted. It's supported by Bing, Yandex, Naver, Seznam.cz, and Yep, but NOT by Google, which has stated it has no plans to adopt it.

Common misconception: IndexNow does NOT push URLs into Google's index. For Google, the only API-side levers are sitemap resubmission (signals re-process) and manual 'Request Indexing' in GSC URL Inspection (UI-only, capped at ~10/day per property).

Source: [IndexNow: Official protocol documentation](https://www.indexnow.org/)

## Core Web Vitals

Core Web Vitals are three Google-defined page-experience metrics that measure real-user loading speed, interactivity, and visual stability: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). They became a Google ranking factor in 2021 and are reported in Google Search Console.

Common misconception: Core Web Vitals have modest direct ranking impact, Google has said it's a tiebreaker, not a primary signal. The larger SEO impact is indirect: better Core Web Vitals reduce bounce rate, which improves engagement signals, which compounds to better rankings over time.

Source: [web.dev: Core Web Vitals](https://web.dev/articles/vitals)

## Schema Markup

Schema markup is structured data added to a webpage in JSON-LD, Microdata, or RDFa format that explicitly tells search engines and AI systems what the content is about. The schema.org vocabulary is the standard used by Google, Bing, Yandex, and most LLM crawlers, defining hundreds of types (Article, FAQPage, Product, Organization, Person, etc.).

Common misconception: Schema markup does NOT directly improve ranking position in Google. It enables rich result eligibility (review stars, FAQ accordions, recipe cards) and helps AI systems extract structured answers, but the underlying ranking signal is the content quality, not the schema wrapper.

Source: [schema.org: Full vocabulary](https://schema.org/)

## Conversion Rate Optimization (CRO)

Conversion Rate Optimization (CRO) is the systematic practice of improving the percentage of website visitors who complete a desired action, submitting a form, booking a call, purchasing a product. Standard CRO methodology: hypothesis → A/B test → measure → ship → repeat, using statistical significance to validate changes.

Common misconception: CRO isn't 'button color and copy tests.' Those are surface-level optimizations. The 60% of CRO impact comes from structural decisions: which audience the page targets, what offer the page makes, what proof it surfaces, what friction the form imposes.

Source: [Google: Best practices for landing pages](https://support.google.com/google-ads/answer/2404197)

## Google Knowledge Graph

Google Knowledge Graph is Google's structured-data database of real-world entities, people, organizations, places, products, and the relationships between them. Introduced in 2012, it powers Knowledge Panels (the entity cards on the right side of SERPs) and feeds entity-recognition systems used by Google Search, AI Overviews, and Gemini.

Common misconception: You can't directly submit an entity to the Knowledge Graph. Google extracts entities automatically from authoritative third-party sources. The fastest path is creating a Google Business Profile + Crunchbase + LinkedIn Company + Wikipedia (when notable enough), Google consolidates them into a single entity.

Source: [Google: Introducing the Knowledge Graph (2012)](https://blog.google/products/search/introducing-knowledge-graph-things-not/)

## Quality Score

Quality Score is Google Ads' 1-to-10 diagnostic rating per keyword based on three signals: expected click-through rate, ad relevance to the query, and landing page experience. It is a backward-looking calculated metric, improving it requires improving the three input signals; it cannot be set or bid directly.

Common misconception: Quality Score is not a ranking factor in the live auction; Ad Rank is. Quality Score is a diagnostic display of historical performance. Obsessing over the number itself is cargo-cult optimization; fix the three input components and Quality Score follows.

Source: [Google Ads: About Quality Score](https://support.google.com/google-ads/answer/6167118)

## Customer Match

Customer Match is Google Ads' first-party-data targeting feature that lets advertisers upload hashed customer lists (emails, phone numbers, mailing addresses) to target, exclude, or model lookalikes of those users across Search, YouTube, Gmail, Display, and Shopping. Match rates typically run 40-60% for consumer audiences and 50-70% for B2B/HCP audiences who use professional email addresses consistently.

Common misconception: Customer Match is not a guarantee that targeted users will see your ads, it's a probability boost in auctions where the user is eligible. The actual ad delivery still depends on bidding, ad rank, and inventory availability.

Source: [Google Ads: About Customer Match](https://support.google.com/google-ads/answer/6379332)

## GCLID (Google Click Identifier)

GCLID is the unique tracking parameter Google Ads appends to ad click URLs (`?gclid=XYZ`) to identify each individual click. Capturing the GCLID in a hidden form field, persisting it through the lead-to-sale lifecycle in a CRM, and uploading it back to Google as an offline conversion is the most accurate way to tie a closed deal to the originating ad click.

Common misconception: GCLID is not the same as a UTM parameter. UTMs are advertiser-defined and human-readable; GCLID is Google-generated and required for offline-conversion attribution. A CRM that captures UTMs but not GCLID cannot perform Smart Bidding offline-conversion uploads.

Source: [Google Ads: About auto-tagging and GCLID](https://support.google.com/google-ads/answer/3095550)

## Enhanced Conversions

Enhanced Conversions is Google Ads' privacy-preserving conversion-tracking enhancement that sends hashed first-party customer data (email, phone, name, address) alongside the standard conversion event. The hashed data is matched against Google's signed-in user base to attribute conversions that would otherwise be lost to cookie deprecation, iOS tracking restrictions, or cross-device behavior.

Common misconception: Enhanced Conversions is not the same as Customer Match: Enhanced Conversions enhances conversion ATTRIBUTION, while Customer Match drives TARGETING. They share the hashed-PII mechanism but serve different parts of the funnel.

Source: [Google Ads: About Enhanced Conversions](https://support.google.com/google-ads/answer/9888656)

## Google Business Profile

Google Business Profile (formerly Google My Business) is Google's free local-business listing system that powers the Google Maps panel, the local 3-pack on Search SERPs, and entity verification in the Knowledge Graph. A verified GBP listing is the single highest-leverage local-SEO signal available to a brick-and-mortar business.

Common misconception: Creating a GBP listing isn't the verification step. Google sends a postcard, phone call, email, or video verification request after creation that must be completed before the listing appears in Maps or local-pack results. Unverified listings are invisible to users.

Source: [Google Business Profile Help](https://support.google.com/business/answer/3038177)

## YMYL (Your Money or Your Life)

YMYL is Google's classification for content topics that could impact a user's future happiness, health, financial stability, or safety. Pages in YMYL categories, medical advice, financial products, legal information, news on civic events, child safety, are held to substantially higher E-E-A-T standards by Google's Search Quality Rater Guidelines.

Common misconception: YMYL isn't a single binary tag; it's a spectrum. A blog post about budgeting tips is moderate-YMYL; the same site's mortgage calculator is high-YMYL. The required E-E-A-T standard scales with the impact severity, not the topic category alone.

Source: [Google: Search Quality Rater Guidelines (PDF, Section 2.3 covers YMYL)](https://services.google.com/fh/files/misc/hsw-sqrg.pdf)

## Ad Rank

Ad Rank is the value Google Ads calculates for every auction to decide whether your ad shows and in what position. It multiplies your bid by your Quality Score components and factors in the expected impact of ad assets and extensions, the context of the search, and Ad Rank thresholds. A higher Ad Rank can win a better position even at a lower bid than a competitor.

Common misconception: Ad Rank is NOT just your bid. Two advertisers bidding the same amount can land in different positions because Quality Score and expected asset impact change the calculation. This is why 'just bid higher' is rarely the most efficient way to win position.

Source: [Google Ads Help: About Ad Rank](https://support.google.com/google-ads/answer/1722122)

## Keyword Match Types

Match types control how closely a search query must align with your keyword before your ad is eligible to show. Google Ads offers three: broad match (widest reach, matches related searches and intent), phrase match (matches queries that include the meaning of your keyword), and exact match (matches the keyword's meaning most tightly). The match type you choose trades reach against precision.

Common misconception: Exact match is not literal anymore. The keyword [running shoes] in exact match can trigger on 'shoes for running' or 'jogging sneakers'. Advertisers who assume exact = verbatim are often surprised by their search-terms report.

Source: [Google Ads Help: About keyword matching options](https://support.google.com/google-ads/answer/7478529)

## ROAS (Return on Ad Spend)

ROAS is revenue generated divided by advertising spend, usually expressed as a ratio or percentage. A ROAS of 400% (or 4:1) means $4 of revenue for every $1 spent. It is the primary efficiency metric for e-commerce and revenue-attributable campaigns, and the target Google's Target ROAS Smart Bidding strategy optimizes toward.

Common misconception: A higher ROAS is not always better. A very high ROAS often means you're under-spending and leaving profitable volume on the table. The goal is the ROAS that maximizes total profit, not the highest possible ratio.

Source: [Google Ads Help: About Target ROAS bidding](https://support.google.com/google-ads/answer/6268637)

## Lookalike / Similar Audiences

A lookalike audience is a targeting segment built by an ad platform's machine learning to find new users who resemble an existing source audience (such as your customer list or website converters). Meta calls them Lookalike Audiences; Google deprecated standalone 'Similar audiences' in 2023, folding the capability into Smart Bidding's automatic optimized targeting.

Common misconception: Bigger source audiences don't make better lookalikes. A focused seed of 1,000 high-value customers usually outperforms a seed of 50,000 mixed-quality leads, because the model learns from signal, not volume.

Source: [Google Ads Help: Optimized targeting (replaced Similar audiences)](https://support.google.com/google-ads/answer/12077475)

## Attribution Window

An attribution window (or conversion window) is the period after an ad interaction during which a resulting conversion is credited to that ad. If a user clicks an ad and converts 20 days later, a 30-day click window credits the ad; a 7-day window does not. The window you choose materially changes which channels appear to drive results.

Common misconception: A shorter attribution window doesn't make your ads less effective, it just credits fewer of the conversions they actually influenced. Teams that shrink windows to 'be conservative' often cut their best top-of-funnel campaigns based on artificially low numbers.

Source: [Google Ads Help: About conversion attribution](https://support.google.com/google-ads/answer/6259715)

## Negative Keywords

Negative keywords are terms you add to a campaign or ad group to prevent your ads from showing on searches that include them. They are the primary control mechanism for eliminating wasted spend on irrelevant queries, and the discipline that makes broader match types safe to run at scale.

Common misconception: Negative keywords aren't a one-time setup. The search-terms report surfaces new wasteful queries every week as match types interpret fresh searches. An account whose negative list hasn't grown in months is almost certainly leaking spend.

Source: [Google Ads Help: About negative keywords](https://support.google.com/google-ads/answer/2453972)

## Competitor Conquesting

Competitor conquesting is bidding on a competitor's brand name as a Google Ads keyword so your ad shows when people search for them. It is legal and permitted by Google's policy in most markets, Google restricts trademarks only in ad text, not in keyword targeting. Using the competitor's trademark in your ad copy is a separate question, usually disallowed if they've filed a trademark complaint.

Common misconception: Bidding on a competitor's brand name will NOT get your account penalized, there's no penalty for it, and it doesn't affect your Quality Score on your own keywords. The only enforcement is ad disapproval if you use their trademark in ad text where a complaint is on file.

Source: [Google Ads Help: Trademark policy](https://support.google.com/adspolicy/answer/6118)

## CPC (Cost Per Click)

CPC is the amount you pay each time someone clicks your ad. In the Google Ads auction your actual CPC is usually less than your maximum bid: it is roughly the Ad Rank of the advertiser below you divided by your Quality Score, plus one cent. Average CPC is total cost divided by total clicks over a period.

Common misconception: Lowering your max CPC bid does not reliably lower costs, it usually just lowers your position and impression share. Improving Quality Score is the durable way to pay less per click.

Source: [Google Ads Help: How the cost-per-click is determined](https://support.google.com/google-ads/answer/1704424)

## CPA (Cost Per Acquisition)

CPA is the average amount you pay for one conversion: total cost divided by total conversions. 'Acquisition' means whatever you've defined as a conversion, a lead, a sale, a booked call. It is the core efficiency metric for lead-generation accounts and the target Google's Target CPA Smart Bidding strategy optimizes toward.

Common misconception: The lowest CPA is not the goal. Pushing CPA too low usually starves volume; the right CPA is the one that maximizes total qualified pipeline within your margin.

Source: [Google Ads Help: About Target CPA bidding](https://support.google.com/google-ads/answer/6268632)

## CTR (Click-Through Rate)

CTR is the percentage of people who clicked your ad after seeing it: clicks divided by impressions. It measures how relevant and compelling your ad is to the searches it shows for, and it is a direct input into Quality Score through the 'expected CTR' component.

Common misconception: A high CTR is not automatically good. Clicks you pay for that never convert are expensive; CTR matters only alongside what happens after the click.

Source: [Google Ads Help: Clickthrough rate (CTR)](https://support.google.com/google-ads/answer/2615875)

## Conversion Rate

Conversion rate is the percentage of clicks (or interactions) that result in a conversion: conversions divided by clicks. It is the clearest measure of how well your landing page and offer turn paid traffic into action, and the lever with the biggest leverage on cost per acquisition.

Common misconception: A low conversion rate is usually blamed on traffic quality, but more often the landing page, form length, or offer is the bottleneck, the same traffic converts far better with a better page.

Source: [Google Ads Help: Conversion rate](https://support.google.com/google-ads/answer/2684489)

## Impression Share

Impression share is the percentage of impressions your ads received out of the total they were eligible for. Google also reports the two reasons you missed the rest: impression share lost to rank (your Ad Rank wasn't high enough) and lost to budget (you ran out of money). It is the clearest measure of how much available demand you're actually capturing.

Common misconception: Low impression share is not automatically a problem to throw budget at. If it's lost to rank, more budget does nothing, you need a higher Quality Score or bid; only 'lost to budget' is solved with money.

Source: [Google Ads Help: About impression share](https://support.google.com/google-ads/answer/2497703)

## Auction Insights

Auction Insights is a Google Ads report showing how your performance compares to other advertisers in the same auctions, across six metrics including impression share, overlap rate, position above rate, and outranking share. It reveals who you compete with and whether you're winning, but never their keywords, budgets, or bids.

Common misconception: Auction Insights does not expose competitor keywords or budgets. Any tool claiming to pull a rival's spend 'from Auction Insights' is selling a fiction, the report only shows comparative auction position.

Source: [Google Ads Help: About Auction Insights](https://support.google.com/google-ads/answer/2579754)

## Target CPA (tCPA)

Target CPA is a Smart Bidding strategy where you set the average cost you're willing to pay per conversion, and Google automatically sets bids in each auction to hit that target across the campaign. It optimizes toward your CPA goal using signals like device, location, time, and audience that manual bidding can't process in real time.

Common misconception: Lowering your Target CPA does not force cheaper conversions, it usually just throttles volume as Google bids only on the safest auctions. Move the target gradually and watch volume, not just CPA.

Source: [Google Ads Help: About Target CPA bidding](https://support.google.com/google-ads/answer/6268632)

## Responsive Search Ads (RSA)

Responsive Search Ads are the standard Google Search ad format: you supply up to 15 headlines and 4 descriptions, and Google mixes and matches them in real time to find the best-performing combinations for each query. RSAs replaced the older Expanded Text Ads as the only standard search format.

Common misconception: More headlines isn't automatically better if they're near-duplicates. RSAs reward distinct value propositions, not volume of slightly different phrasings.

Source: [Google Ads Help: About responsive search ads](https://support.google.com/google-ads/answer/7684791)

## Dynamic Search Ads (DSA)

Dynamic Search Ads target searches based on the content of your website rather than a keyword list. Google crawls your pages (or a page feed you supply) and auto-generates the headline and landing page to match relevant queries. The advertiser writes only the description line.

Common misconception: DSAs are not a 'set and forget' way to skip keyword research. Without disciplined negatives and page targeting, they drift onto irrelevant queries and waste budget.

Source: [Google Ads Help: About Dynamic Search Ads](https://support.google.com/google-ads/answer/2471185)

## Remarketing (Retargeting)

Remarketing shows ads to people who have already interacted with your site, app, or videos, on Search, Display, YouTube, or Shopping. It re-engages warm audiences who didn't convert the first time. On Search specifically, RLSA (Remarketing Lists for Search Ads) lets you adjust bids or keywords for past visitors who search again.

Common misconception: Remarketing's high conversion rate doesn't mean it caused those conversions, many of those users would have returned anyway. Measure incremental lift, not just last-click conversions, before scaling spend.

Source: [Google Ads Help: About remarketing](https://support.google.com/google-ads/answer/2453998)

## Local Services Ads (LSA)

Local Services Ads are a pay-per-lead format that appears at the very top of local search results, above standard Google Ads, with a Google Guaranteed or Google Screened trust badge. You pay per qualified lead (a call or message), not per click, and must pass license and insurance verification to run them.

Common misconception: LSAs are not just 'Google Ads at the top.' They're a different product, pay-per-lead, verification-gated, and ranked on reviews and responsiveness rather than bids.

Source: [Google Ads Help: About Local Services Ads](https://support.google.com/localservices/answer/6224841)

## Google Guaranteed

Google Guaranteed is the verification badge (green checkmark) shown on Local Services Ads for home-service businesses that passed Google's license, insurance, and background checks. Jobs booked through the ad are backed by a limited money-back guarantee for unsatisfied customers, up to a $2,000 lifetime cap per customer in the US. The badge cannot be bought separately; it is earned through Local Services Ads verification.

Common misconception: Google Guaranteed is not a paid endorsement or a ranking boost you can buy. It is a verification gate: every business running Local Services Ads in a guaranteed category has it, and ranking among badged businesses is decided by reviews, responsiveness, and proximity.

Source: [Google Help: About the Google Guarantee](https://support.google.com/localservices/answer/7549288)

## Google Screened

Google Screened is the verification badge shown on Local Services Ads for licensed professionals, lawyers, financial advisors, and real estate agents. It confirms Google has verified the professional licenses of everyone serving clients through the ad and completed background checks. Unlike Google Guaranteed, it carries no money-back guarantee; the badge is purely a license-verified trust signal.

Common misconception: Google Screened does not mean Google endorses the quality of the professional's work or guarantees outcomes. It verifies licenses and background only; the reimbursement guarantee people associate with the badge belongs to Google Guaranteed, the home-services variant.

Source: [Google Help: Badges for Local Services Ads](https://support.google.com/localservices/answer/7549288)

## Ad Assets (Ad Extensions)

Ad assets (formerly called ad extensions) are extra pieces of information attached to a search ad, sitelinks, callouts, structured snippets, call buttons, location, price, and promotions. They expand the ad's size and usefulness, and Google shows them when they're predicted to improve performance.

Common misconception: Assets don't always show, and that's normal. Google displays them based on predicted impact, position, and ad rank, providing them makes you eligible, it doesn't guarantee display.

Source: [Google Ads Help: About assets](https://support.google.com/google-ads/answer/7332837)