Performance Marketing Glossary
Plain-English definitions of the terms founders actually need. No textbook fluff, just the context and tradeoffs that matter when you're running real money through real channels.
A - B
A/B Test
An experiment where you run two variants (A vs B) against a randomized audience split and measure which one produces a better outcome for a specific metric. Valid A/B tests require statistical significance before declaring a winner. Most founders pull the plug too early. Our A/B Test Calculator tells you when you've got enough data, and this post explains why most creative tests are just expensive opinions.
AI Overviews
Google's AI-generated answer summaries that appear at the top of some search results, synthesizing content from multiple sources. AI Overviews compete with the traditional ten blue links for user attention. Getting cited in AI Overviews requires strong structured data, clear answer-shaped content, and entity authority - the core of AI SEO.
AI SEO
The practice of optimizing your brand for visibility in AI-powered search tools: ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews. Traditional SEO targets ten blue links; AI SEO targets the one-paragraph answer the model generates. Requires structured data, llms.txt files, entity-first content, and answer-shaped writing. See Noble Growth's AI SEO services and the full playbook.
AOV (Average Order Value)
Total revenue divided by number of orders. A lever for ecommerce brands: if AOV rises 20%, you can afford 20% more on CAC and stay breakeven. Tactics that move AOV: bundling, upsells in cart, threshold-based free shipping, post-purchase upsells. Too many brands focus only on conversion rate when AOV is actually the bigger lever.
Attribution
The process of assigning credit for a conversion to the marketing touchpoints that drove it. Platforms exaggerate their own role (Meta credits last-touch clicks within a 7-day window; Google Enhanced Conversions credits view-through and click-through; email tools credit last-opened). Add up all platform-attributed revenue and you'll often see 150-200% of your actual revenue. See The Attribution Problem.
Broad Match (Google Ads)
A keyword match type in Google Ads where your ad can show on any query Google considers related to your keyword. Modern broad match combined with smart bidding is powerful but aggressive - without strong negative keyword lists, broad match will spend on queries you'd never approve. The right answer in 2026 is broad match + smart bidding + relentless negative keyword maintenance.
C - D
CAC (Customer Acquisition Cost)
The total cost to acquire a paying customer. Usually calculated as (total marketing spend) / (new customers). Blended CAC includes all spend; paid CAC isolates paid channels; channel-specific CAC isolates one source. The useful version depends on your question. CAC is only meaningful in context with LTV: use this calculator to work the math.
CAPI (Conversions API)
Server-side conversion tracking used by Meta (and similarly by other platforms) that sends conversion data directly from your server to the ad platform, bypassing browser-based pixel limitations. Critical post-iOS 14.5 because browser-based tracking is unreliable. Every Noble Growth ecommerce client runs Meta CAPI.
CPA (Cost Per Acquisition)
The cost to generate one conversion. Sometimes interchangeable with CAC, though CPA often refers to a specific conversion (lead, signup, purchase) while CAC refers to a paying customer specifically. Target CPA should be set based on LTV and margin math, not platform benchmarks.
CPC (Cost Per Click)
The cost of a single click on your ad. Driven by quality score (on Google), auction competition, ad relevance, and platform saturation. CPC is a diagnostic metric, not a performance metric - a high CPC combined with a high conversion rate can still be profitable.
CPM (Cost Per Mille)
The cost to serve 1,000 ad impressions. Measures how expensive it is to reach your audience. Rising CPM combined with falling CTR is the signature of creative fatigue. CPM rising in isolation usually means auction pressure from competitors.
CRO (Conversion Rate Optimization)
The practice of improving the percentage of visitors who complete a desired action (purchase, signup, form submission). Usually higher-leverage than chasing more traffic - doubling conversion rate is economically identical to halving CAC. See Noble Growth's CRO service.
CTR (Click-Through Rate)
Clicks divided by impressions, expressed as a percentage. A leading indicator of creative performance: falling CTR over time usually signals creative fatigue. But CTR alone is misleading - the 3-second audit method in this post explains how to read CTR in context.
E - F
Enhanced Conversions (Google)
Google's first-party data conversion tracking that uses hashed email, phone, and name data to improve conversion measurement in the iOS 14.5+ era. Setting up Enhanced Conversions is one of the highest-leverage technical fixes for any Google Ads account - usually takes 30-60 minutes but improves reported conversion volume by 10-20% because you're capturing conversions that standard pixel tracking misses.
Entity SEO
An SEO approach focused on building authority around named entities (people, companies, concepts) rather than raw keyword density. Important for AI SEO because language models reason in entities. Practically: linking named people and brands to their canonical URLs, using Person and Organization schema, and structuring content to reinforce entity relationships.
Feed Optimization (Shopping)
Improving the product feed used by Google Shopping, Meta catalog ads, and similar. Covers title structure, GTIN coverage, custom labels for bidding segmentation, product type hierarchy, and image quality. For most ecommerce accounts running Shopping or PMax, feed optimization has higher leverage than campaign-level bidding changes.
Frequency (Paid Social)
The average number of times a person in your audience has seen a specific ad over a window (typically 7 or 14 days). Rising frequency combined with falling CTR is the signature of creative fatigue. Yellow flag on Meta: 3+ in 7 days for cold prospecting. Red flag: 5+ in 7 days.
G - I
GA4 (Google Analytics 4)
Google's current analytics platform, replacing Universal Analytics. Event-based instead of session-based, with AI-driven insights and cross-device tracking. Required for any serious performance marketing setup. We configure GA4 with enhanced ecommerce events, custom conversion events, and proper UTM-source parameter hygiene for every Noble Growth client.
GSC (Google Search Console)
Google's free tool for monitoring your site's performance in Google Search. Shows which queries you appear for, your average position, click-through rate, and impression counts. The ground truth for SEO performance - more reliable than third-party tools which estimate based on limited data.
Hook Rate
The percentage of people who watch past the first 3 seconds of a video ad. A leading indicator for video performance - a strong hook rate correlates with strong downstream ROAS. See You've Got 3 Seconds for the full breakdown and Video Ad Script Generator for the tool.
Impressions
The number of times an ad is served. Not a quality metric on its own - a million impressions with 0 clicks is worthless. Impressions are useful as a denominator for CPM and CTR calculations.
Incrementality
The causal effect of a marketing activity - sales that wouldn't have happened without it. Incrementality differs from platform-attributed revenue: Meta might claim 5x ROAS, but if those customers were going to convert from email anyway, the incremental lift is zero. Measured via geo holdouts, audience holdouts, or causal inference. The real north star for sophisticated paid media programs.
L - M
llms.txt
A plain-text file at the root of a website that provides language models a clean, canonical summary of the site's content. Analogous to robots.txt but for AI consumption. An emerging standard for AI SEO. See noblegrowth.co/llms.txt and /llms-full.txt as production examples.
LTV (Lifetime Value)
The total revenue (or profit, depending on who's asking) you expect from a customer over their entire relationship with your brand. LTV determines how much you can afford to spend on CAC. Most brands underestimate LTV because they only measure the first purchase. See The Brand That Knows Its LTV Wins Every Auction.
Match Type (Google Ads)
How strictly Google Ads matches a user's search query to your target keyword. Exact match matches only your exact keyword and close variants; phrase match matches queries containing your keyword phrase; broad match matches any query Google considers related. Modern accounts typically use a mix of phrase and broad match + smart bidding + aggressive negative keywords.
Message Match
The consistency between an ad's promise and the landing page's delivery. Message match failure - ad says "50% off summer sale," landing page says "shop new arrivals" - is the #1 silent conversion killer in paid media. Check your own pages with our Message Match Checker. Full philosophy in Your Ad Earned the Click.
MMM (Marketing Mix Modeling)
A statistical approach to measuring marketing ROI across channels using aggregated historical data (spend, sales, external factors). Complementary to attribution - MMM tells you the long-run causal contribution of each channel; attribution tells you the short-run clicked path. Useful for large spenders ($500k/mo+) but overkill for smaller brands.
O - P
Offer
The complete value proposition being presented - product, price, bonus, guarantee, urgency mechanics - not just the thing you're selling. Most performance problems are offer problems in disguise. See Your Ad Budget Is a Tax on a Weak Offer and Offer Stack Builder.
PAA (People Also Ask)
Google's SERP feature showing related questions that expand inline. Getting cited in PAA requires answer-shaped content - question phrasing that matches user searches, followed by direct answers. FAQ schema helps. PAA optimization overlaps heavily with AI SEO.
PMax (Performance Max)
Google's AI-driven campaign type that spans Search, Display, YouTube, Gmail, Shopping, and Discover from one campaign. Powerful when configured well (audience signals, asset groups, aggressive search term exclusions); dangerous on defaults (will consume brand traffic and credit itself for revenue that wasn't incremental). See How to Run Google Ads Profitably.
Q - S
Quality Score (Google Ads)
A 1-10 score Google assigns to each keyword measuring expected CTR, ad relevance, and landing page experience. Higher quality score = lower CPC for the same ad rank. One of the most under-leveraged levers in mid-sized Google Ads accounts. Improving quality score usually means improving landing page relevance and ad copy tightness.
Retargeting
Advertising to people who've already interacted with your brand - visited your site, viewed a product, started checkout, subscribed to email. Higher intent than cold prospecting, but smaller audience. Most brands show the same ad to everyone - that's not retargeting, that's hope. Use Retargeting Stack Planner to build a tiered system.
ROAS (Return on Ad Spend)
Revenue divided by ad spend. A 4x ROAS means every $1 of ad spend returned $4 in revenue. ROAS is a gross metric - doesn't account for COGS, shipping, or operating costs. Two different businesses with 4x ROAS can have completely different profit margins. See ROAS Benchmarks for Paid Ads.
Schema Markup
Structured data embedded in HTML that helps search engines and language models understand what a page is about. Formats include JSON-LD (most common), Microdata, and RDFa. Important schema types: Article, Organization, Product, Service, FAQ, BreadcrumbList, Review, VideoObject. Foundation of AI SEO.
SEO (Search Engine Optimization)
The practice of improving a website's visibility in search engine results. Traditional SEO focuses on keywords, backlinks, and site architecture. Modern SEO increasingly overlaps with AI SEO - the same content that ranks in Google often gets cited by ChatGPT and Perplexity too.
T - Z
Thumb-Stop Rate
The percentage of people who stop scrolling to watch your video ad (synonymous with hook rate on most platforms). Gates all downstream performance - if people keep scrolling, no amount of CTA optimization will save you. The hook mechanics and Video Ad Script Generator.
UGC (User-Generated Content)
Content created by users, customers, or paid creators that has an authentic, non-brand-produced feel. Consistently outperforms produced brand video on paid social. See Why Your Polished Brand Video Gets Half the CTR.
UTM Parameters
Tracking codes appended to URLs to identify traffic source, medium, campaign, content, and term. Essential for attribution. Inconsistent UTM usage is one of the most common hidden problems in marketing accounts - if you don't tag properly, GA4 can't tell you where traffic came from. Use our free UTM Link Builder.
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