Glossary
Google Ads terms, explained plainly.
No jargon-on-jargon definitions. If you're learning Google Ads or just trying to understand your own account, this is the reference we point our own trainees to.
How the auction actually works
Bid × Quality Score = Ad Rank.
Everything below ties back to this one relationship — it's worth seeing it laid out before you read the individual term definitions.
Ad Rank determines both where your ad shows and what you actually pay — your Actual CPC is set relative to the Ad Rank of the advertiser ranked just below you, not your maximum bid.
A
Ad Rank
The score that determines your ad's position in an auction and whether it shows at all. Google doesn't publish an exact formula — in practice it weighs your bid, auction-time quality (expected CTR, ad relevance, landing page experience), the competitiveness of that specific auction, the context of the search (device, location, time), and the expected impact of your ad extensions and formats. The classic "Bid × Quality Score" version is a useful simplification, not the literal calculation.
Ad Relevance
One of the three Quality Score components — how closely your ad's message matches the intent behind a search. Increasingly assessed by Google's own models reading intent and content quality, not just keyword string matching.
Auction Insights
A report showing how your ads perform relative to other advertisers bidding on the same auctions — impression share, overlap rate, and position above rate versus competitors.
Avg. CPC
Total cost divided by total clicks over a given period. Different from a single click's CPC — this is the blended average across every click a campaign or keyword received.
B
Bid Adjustments
Percentage modifiers that raise or lower your bid for specific conditions — device, location, audience, or time of day. Under Smart Bidding, these act more as signals to the algorithm than hard multipliers.
Broad Match
A keyword match type that shows your ad for searches related to the meaning of your keyword, not just its exact wording. Paired with Smart Bidding, it's been the default operating model for most well-optimized accounts for several years — the trade-off is reach and intent-matching in exchange for needing strong conversion signals and negative-keyword hygiene to keep it accurate.
C
Clicks
The number of times people clicked your ad. The most basic engagement metric — useful on its own, but only meaningful alongside CTR, cost, and conversions.
Conversions (Conv.)
The number of times an action you've defined as valuable — a purchase, a lead form submission, a sign-up — was completed after someone interacted with your ad.
Conv. value
The total value assigned to your conversions, based on the value you've set for each conversion action (e.g. average order value, or a fixed value per lead).
Conv. value / cost
Conversion value divided by cost — functionally the same measure as ROAS, shown as a ratio in reporting columns rather than a labeled ROAS figure.
Cost
The total amount spent on a campaign, ad group, or keyword over the selected date range.
Cost / conv. (CPA)
Also called Cost Per Acquisition. How much you spend, on average, to get one conversion — a core efficiency metric. The goal is usually to lower this without losing conversion volume.
CPC (Cost Per Click)
The amount charged for a single click. Distinct from Avg. CPC, which is the average across all clicks over a period.
CTR (Click-Through Rate)
The percentage of people who see your ad and click it. A key input into Quality Score — low CTR relative to competitors signals your ad isn't relevant enough to the search.
D
Demand Gen
A campaign type built for reaching people across YouTube, Discover, and Gmail with visually-driven ads — designed for building demand rather than capturing existing search intent.
E
Expected CTR
One of the three Quality Score components — how likely your ad is to be clicked when shown, based on past performance and relevance, independent of ad position or extensions.
I
Impressions
The number of times your ad was shown, regardless of whether it was clicked.
Search Impr. Share (Impression Share)
The percentage of eligible auctions where your ad actually showed, out of every auction it was eligible to compete in on the Search Network. Less than 100% means you're missing opportunities — either due to budget limits or Ad Rank.
Search Lost IS (Rank)
The percentage of impressions you missed specifically because your Ad Rank wasn't high enough — a signal to review your bid strategy, Quality Score, or ad relevance, not just "raise the bid."
Search Lost IS (Budget)
The percentage of impressions you missed because your campaign ran out of daily budget — a signal that budget, not competitiveness, is the constraint.
L
Landing Page Experience
The third Quality Score component — how relevant, fast, and easy to act on your landing page is once someone clicks. Entirely within your control, unlike the bid-driven parts of the auction.
M
Merchant Center
Google's platform for managing the product feed that powers Shopping campaigns — where product data, pricing, and availability are submitted and diagnosed for issues.
P
Pacing
How evenly your daily budget is spent across the day. Spend that exhausts by noon misses the rest of the day's high-intent traffic; spend that never reaches its cap leaves budget — and potential conversions — on the table.
Performance Max (PMax)
A goal-based campaign type that runs ads across all of Google's inventory — Search, Display, YouTube, Discover, Gmail, Maps — using automated bidding and creative optimization.
Q
Quality Score
A 1–10 diagnostic score reflecting your ad's expected CTR, ad relevance, and landing page experience relative to other advertisers. Higher Quality Score generally means lower costs for the same ad position.
R
ROAS (Return on Ad Spend)
Revenue generated per unit of currency spent on ads. A ROAS of 4x means $4 in revenue for every $1 spent — the primary efficiency metric for e-commerce and revenue-driven accounts. Shown in some reports as Conv. value / cost.
S
Smart Bidding
Google's umbrella term for automated bidding strategies (Target CPA, Target ROAS, Maximize Conversions, Maximize Conversion Value) that set your bid at each individual auction using real-time signals. Paired with broad match, it's been the standard operating model for well-optimized accounts for several years — the work shifts from setting bids to feeding it clean conversion data.
T
Target CPA
An automated bidding strategy where you set a target cost per acquisition, and Google's algorithm adjusts bids at each individual auction to hit that average across the campaign.
Target ROAS
An automated bidding strategy where you set a target return on ad spend, and Google's algorithm bids to hit that average return across the campaign.
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