Digital marketing glossary

ROAS measures how much revenue an ad campaign generates for every unit of currency spent. A 4x ROAS means you earn 4 for every 1 spent on ads. It is the headline metric for evaluating ecommerce ad profitability, though it should be read alongside profit margin and attribution settings.

tROAS is a Google Smart Bidding strategy where the algorithm automatically adjusts bids to hit a target return on ad spend you set. It works best for accounts with enough conversion volume and reliable tracking. Setting an unrealistic target can choke volume, so it is tuned over time.

Performance Max is a Google Ads campaign type that uses AI to serve ads across all Google inventory — Search, Shopping, YouTube, Display, Discover, and Gmail — from a single campaign. It is powerful for scale but opaque, so strong feed quality, asset groups, and conversion tracking are essential to keep it controllable.

The Conversions API sends conversion data from your server directly to an ad platform (such as Meta), instead of relying only on browser pixels. Server-side tracking via CAPI restores measurement accuracy lost to cookie blocking and ad blockers, and improves ad delivery and attribution.

Quality Score is Google's rating of your keyword, ad, and landing-page relevance on a scale of 1–10. Higher Quality Scores lower your cost per click and improve ad rank. It is improved by tightening keyword-ad-copy-message match and by fast, relevant landing pages.

CPC is the amount you pay each time someone clicks your ad. It is determined by an auction that weighs your bid, Quality Score, and the expected impact of ad formats. CPC varies widely by industry, keyword intent, and geography.

CPL measures how much you pay to acquire one qualified lead. It is the key efficiency metric for lead-generation campaigns. Reducing CPL usually means improving landing-page conversion, tightening audience targeting, and pruning wasted spend.

CPA is the total cost to acquire one customer (or one defined conversion). It is calculated as total ad spend divided by conversions. CPA is the metric that ties marketing spend to actual business outcomes, making it more meaningful than clicks or impressions.

CTR is the percentage of people who click your ad or result after seeing it. It is calculated as clicks divided by impressions. A high CTR signals strong relevance between your creative, your targeting, and user intent.

CVR is the percentage of visitors who complete a desired action — such as a purchase or lead form — after landing on your page. It is calculated as conversions divided by sessions. CVR is the central metric of conversion rate optimization (CRO) work.

CRO is the systematic process of increasing the percentage of visitors who convert, through testing and improving landing pages, forms, and user journeys. It combines UX analysis, hypothesis-driven A/B testing, and data validation to lift revenue from existing traffic.

GEO is the practice of optimizing content so it is surfaced and cited by AI engines like ChatGPT, Perplexity, and Google AI Overviews. It relies on clear structure, answer-ready content, and valid schema. GEO complements traditional SEO rather than replacing it.

AEO is closely related to GEO and focuses on making content answerable — written so a question can be matched to a complete, self-contained answer. Strong AEO uses definitional and comparison formats, FAQ schema, and extractable paragraphs.

GA4 is Google's event-based analytics platform that tracks users across websites and apps. It replaced Universal Analytics and uses an event + parameter data model. Correct GA4 setup — events, conversions, and linked accounts — is the foundation of reliable marketing measurement.

Server-side tracking sends event data from your own server to analytics and ad platforms, rather than relying on a client-side pixel in the browser. It improves data accuracy, survives ad blockers and cookie restrictions, and gives you control over what data is shared.

Schema markup is structured data you add to a page so search engines and AI engines can understand its meaning — for example that a page is a Service, FAQ, or Article. Valid schema helps with rich results and makes content easier for machines to extract and cite.

Retargeting shows ads to people who previously visited your site or app. It is one of the highest-ROI tactics because it re-engages warm audiences. Modern retargeting relies on first-party data and server-side events as third-party cookies decline.

LTV estimates the total revenue a customer generates over their entire relationship with your business. Comparing LTV to CPA tells you whether acquisition is sustainable. LTV is increased through retention, lifecycle marketing, and loyalty programmes.

Attribution is the method of assigning credit for a conversion across the marketing touchpoints a customer touched. Models range from last-click to data-driven. Choosing the right model affects budget allocation, so it is configured deliberately, not left on defaults.

Core Web Vitals are Google's speed and user-experience metrics: Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift. They are a confirmed ranking factor and a core part of technical SEO and site-speed optimization.