Search advertising: reaching people at the moment they look
Search ads are the text listings that appear above and below organic results when someone types a query. They are the oldest major form of digital advertising and still the most direct: the searcher tells you exactly what they want, and you pay only when your answer earns a click.
The keyword auction
Every eligible search can trigger an instant auction among advertisers whose targeting and keywords match the query. The decision combines several signals:
- Your bid — the maximum you are willing to pay for a click (or the target you give an automated bidding strategy).
- Auction-time ad quality — the platform's estimate of expected response, relevance and landing-page experience for this context.
- Eligibility and context — budget, location, device, time, policy status, thresholds, competing results and the expected effect of ad assets.
The practical consequence is that bid alone does not determine position. A more relevant ad and landing page can compete effectively against a higher bid. The price paid is set by the auction and platform rules, subject to the advertiser's bidding strategy and limits.
Why quality matters commercially: better ads earn a higher expected CTR, which raises Ad Rank without raising bids. Improving relevance is usually the cheapest way to "outbid" a competitor.
Match types: how tightly a keyword binds to a query
Keywords are not exact strings; they are matching rules. The classic ladder, from widest to tightest:
| Match type | Shows for | Trade-off |
|---|---|---|
| Broad | Related searches and synonyms the platform considers relevant | Maximum reach, needs strong negatives and smart bidding |
| Phrase | Searches that include the keyword's meaning | Balanced reach and control |
| Exact | Searches with the same meaning as the keyword | Tightest control, least volume |
| Negative | Blocks matching queries | The main tool for cutting wasted spend |
Account structure that stays manageable
A search account is a hierarchy: campaigns (budgets, locations, bidding) contain ad groups (a tight cluster of keywords plus the ads written for them). The rule that keeps accounts healthy is simple: one theme per ad group. If a keyword wouldn't make sense next to the others, it deserves its own group with its own ad.
Bidding, from manual to automated
You can set bids per keyword yourself, or hand bidding to the platform's automation with a target — such as a target CPA (cost per acquisition) or target ROAS (return on ad spend). Automation adjusts bids per auction using signals no human can process in time, but it only works once conversion tracking is installed and the campaign has accumulated enough conversions to learn from.
Where beginners lose money
- Bidding on broad keywords with no negative-keyword list, paying for irrelevant queries.
- Sending all traffic to the homepage instead of a page that matches the query.
- Judging campaigns on clicks instead of cost per conversion.
- Changing bids, ads and keywords all at once, so no result can be attributed.
A search test plan you can diagnose
A useful test isolates one commercial question. Choose one product or service, one location, one conversion action and one landing page. Then separate high-intent queries from research queries instead of blending them into a single ad group. This structure makes the outcome explainable: a weak click-through rate points toward the keyword-to-ad connection, while a weak conversion rate points toward the landing page, offer or tracking.
| Evidence | Likely issue | First check | Change only after |
|---|---|---|---|
| Few impressions | Low demand, bid, budget or eligibility | Status, location and query volume | Confirming the keyword can enter auctions |
| Impressions, few clicks | Weak relevance or unattractive message | Search terms, ad promise and assets | Separating irrelevant from relevant queries |
| Clicks, few conversions | Page, offer, speed or tracking problem | Conversion tag and landing-page intent | Verifying the conversion fires correctly |
| Conversions, poor economics | CPA exceeds the value of the outcome | Margin, close rate and customer value | Calculating an evidence-based target CPA |
For example, a query for “emergency plumber near me” communicates an immediate service need. A query for “how to fix a leaking tap” communicates research intent. Putting both in the same group hides their different economics. The first may justify a higher bid and a direct booking page; the second may need an educational page or a negative keyword, depending on the campaign goal.
Use the search-terms report as campaign evidence
A keyword is the advertiser's instruction; a search term is what the person actually typed. Review search terms on a consistent schedule and classify them as relevant commercial intent, relevant research, ambiguous, or irrelevant. Add negatives for clearly unwanted meanings, but do not block a phrase merely because it failed once. A single click is an anecdote; a repeated pattern across spend and conversions is evidence.
Quality Score also needs careful interpretation. Google describes it as a diagnostic comparison, not an auction input or business KPI. Its components—expected click-through rate, ad relevance and landing-page experience—help locate a weak experience. Profitability still belongs to CPA, conversion value and ROAS. A high diagnostic score does not rescue a keyword that attracts the wrong customers.
Further reading on this site
Definitions of every term used here are in the glossary; the formulas for judging results are on the metrics page. For the demand-creation counterpart to search, see the paid social guide.
Sources and update notes
This guide explains general mechanics rather than giving platform-specific bidding instructions. Platform interfaces and automation change, so the official documentation below is the authority for current controls.
- Google Ads Help: keyword matching — broad, phrase and exact match relationships.
- Google Ads Help: how matching works — retrieval, eligibility, Ad Rank and auction sequence.
- Google Ads Help: Quality Score — diagnostic purpose and component definitions.
- Google Ads Help: search terms report — the distinction between search terms and keywords.