Online Advertising Terminology — A Practical Overview 📣

Below is a structured glossary of the most common terms you’ll encounter in online ads (Google, Instagram/Meta, YouTube, TikTok, etc.). I’ll group them by how ads are planned, bought, measured, and optimized. 
 
 1) Core building blocks (how campaigns are organized) 
 
 
 Account / Business Manager 
 
 The “container” that holds billing, users/permissions, pixels, and all campaigns (e.g., Google Ads account, Meta Business Manager). 
 
 
 
 Campaign 
 
 The highest-level objective and settings (e.g., Sales , Leads , Traffic , Awareness ). 
 
 
 
 Ad Set / Ad Group 
 
 Where targeting and delivery settings typically live. 
 Meta uses Ad Set ; Google uses Ad Group (especially in Search/Display). 
 
 
 
 Ad / Creative 
 
 The actual ad users see: image/video, headline, copy, CTA button, etc. 
 
 
 
 Objective / Goal 
 
 What the platform optimizes toward (e.g., purchases, leads, landing page views). 
 
 
 
 
 2) Targeting & audiences (who sees the ads) 
 
 
 Audience 
 
 The group of people you want to reach. 
 
 
 
 Targeting 
 
 Filters like location, age, language, interests, behaviors, device, etc. 
 
 
 
 Custom Audience (Meta) / Customer Match (Google) 
 
 Audience built from your data (email list, site visitors, app users). 
 
 
 
 Lookalike Audience (Meta) / Similar Segments (historically Google) 
 
 People who “resemble” your best customers based on a seed audience. 
 
 
 
 Remarketing / Retargeting 
 
 Showing ads to people who already interacted with you (visited site, added to cart, watched video). 
 
 
 
 Placements 
 
 Where ads appear. 
 Examples: Instagram Feed, Stories, Reels; Google Search results; YouTube in-stream; Display network sites. 
 
 
 
 Frequency 
 
 Average number of times a person saw your ad in a period. 
 Often watched for ad fatigue (too many repeat views). 
 
 
 
 
 3) Bidding & budgets (how you pay and how delivery works) 
 
 
 Budget 
 
 Daily budget : per day average spending. 
 Lifetime budget : total spend over a campaign’s run. 
 
 
 
 Bid / Bidding Strategy 
 
 
 How you compete in the auction. 
 
 
 Common approaches: 
 
 Lowest cost / Maximize (spend efficiently to get most results) 
 Cost cap / Target CPA 
 ROAS target (optimize for revenue return) 
 
 
 
 
 
 Auction 
 
 Real-time decision process determining which ad shows, to whom, and at what “price” (influenced by bid, predicted performance, relevance/quality). 
 
 
 
 Pacing 
 
 How spend is distributed over time (smooth vs accelerated, depending on platform and settings). 
 
 
 
 
 4) Pricing models & key metrics (the language of performance) 
 
 
 Impression 
 
 One instance of an ad being shown. 
 
 
 
 Reach 
 
 Unique people who saw the ad. 
 
 
 
 Clicks 
 
 Users clicking the ad (to site, app store, call, etc.). 
 
 
 
 CTR (Click-Through Rate) 
 
 Clicks ÷ impressions. 
 Indicates how compelling the ad is for that audience/placement . 
 
 
 
 CPC (Cost Per Click) 
 
 Spend ÷ clicks. 
 
 
 
 CPM (Cost Per Mille) 
 
 Cost per 1,000 impressions. 
 
 
 
 Conversions 
 
 Desired actions (purchase, lead form, signup, call, add-to-cart). 
 
 
 
 CVR (Conversion Rate) 
 
 Conversions ÷ clicks (or ÷ sessions, depending on reporting). 
 
 
 
 CPA / CPL (Cost Per Acquisition / Cost Per Lead) 
 
 Spend ÷ conversions (or leads). 
 
 
 
 ROAS (Return on Ad Spend) 
 
 Revenue attributed to ads ÷ ad spend. 
 
 
 Example: ROAS 3.0 = \$3 revenue for each \$1 spent. 
 
 
 AOV (Average Order Value) 
 
 Revenue ÷ number of orders. 
 
 
 
 LTV / CLV (Lifetime Value) 
 
 Expected total value of a customer over time (useful for scaling). 
 
 
 
 
 
 5) Tracking & attribution (how results are counted) 
 
 
 Pixel (Meta) / Tag (Google) 
 
 Code installed on your site to track events and build audiences. 
 
 
 
 Event 
 
 A tracked action like PageView , ViewContent , AddToCart , Purchase , Lead . 
 
 
 
 UTM Parameters 
 
 URL tags (e.g., utm_source , utm_medium , utm_campaign ) for analytics tools like GA4. 
 
 
 
 Attribution 
 
 
 Rules for assigning credit to ads for a conversion. 
 
 
 Common concepts: 
 
 Click-through attribution vs view-through attribution 
 Attribution window (e.g., 7-day click, 1-day view) 
 Last-click vs data-driven models (platform dependent) 
 
 
 
 
 
 Conversion API (Meta CAPI) / Enhanced Conversions (Google) 
 
 Server-side tracking to improve measurement when browser tracking is limited. 
 
 
 
 
 6) Creative & messaging terms (what you’re actually showing) 
 
 
 Creative 
 
 The visual/video asset plus messaging. 
 
 
 
 Copy 
 
 The text: primary text, headline, description. 
 
 
 
 CTA (Call to Action) 
 
 The button or prompt (e.g., Shop Now , Learn More ). 
 
 
 
 Landing Page 
 
 The page users arrive at after clicking. 
 
 
 
 Offer 
 
 The value proposition (discount, free trial, bundle, free shipping). 
 
 
 
 Ad Fatigue 
 
 Performance decline as the same audience sees the same creative too often. 
 
 
 
 
 7) Campaign strategy concepts (how people move toward purchase) 
 
 
 Funnel 
 
 TOF (Top of Funnel) : awareness/discovery 
 MOF (Middle of Funnel) : consideration (engagement, site visits) 
 BOF (Bottom of Funnel) : conversion (purchase/lead) 
 
 
 
 Cold / Warm / Hot Audiences 
 
 Cold : never interacted 
 Warm : engaged/visited 
 Hot : high intent (cart/checkout visitors, prior leads) 
 
 
 
 Prospecting 
 
 Reaching new people (cold audiences). 
 
 
 
 Retargeting 
 
 Re-engaging people who showed intent. 
 
 
 
 Incrementality 
 
 Measuring what conversions happened because of ads (vs would have happened anyway). 
 
 
 
 
 8) Testing & optimization terms (improving performance) 
 
 
 A/B Test (Split Test) 
 
 Compare two variants (creative, audience, landing page) under controlled conditions. 
 
 
 
 Creative Testing 
 
 Systematically testing multiple hooks, formats, and angles. 
 
 
 
 Learning Phase (Meta) 
 
 Period where delivery is still stabilizing as the system gathers data. 
 
 
 
 Scaling 
 
 Increasing budget/spend while maintaining efficiency (CPA/ROAS). 
 Vertical scaling : raise budgets on winners 
 Horizontal scaling : expand audiences/creatives/placements 
 
 
 
 Optimization 
 
 Adjusting bids, budgets, creatives, targeting, and landing pages to hit goals. 
 
 
 
 
 9) Platform-specific quick translations (Google vs Meta) 
 
 
 Meta (Instagram/Facebook) 
 
 Campaign → Ad Set → Ad 
 Pixel / CAPI 
 Placements: Feed, Stories, Reels, Audience Network, etc. 
 
 
 
 Google Ads 
 
 Campaign → Ad Group → Ad 
 Search terms, keywords, match types (Search campaigns) 
 Tags, Enhanced Conversions 
 Networks: Search, Display, YouTube, Shopping, Performance Max 
 
 
 
 
 If you tell me your goal, I can tailor this glossary 
 Reply with: 
 
 Your platform(s): Google, Instagram/Meta, TikTok, etc. 
 Your objective: sales, leads, app installs, awareness 
 Your business type: e-commerce, local service, SaaS, creator, etc. 
 
 …and I’ll highlight only the terms you’ll actually use day-to-day (plus what to watch out for) ✅