Search Ads (SA) appear at the top and bottom of search results when a user enters a keyword into a search engine. They are the classic performance-based ad: you pay when a click happens. Because they target the exact moment of clear search intent, conversion efficiency is high. That makes SA a core channel in digital marketing.
How It Works
The advertiser selects keywords and sets a bid and ad copy. When a user searches that keyword, the ad appears on the search engine results page (SERP) with an 'Ad' label. Naver Power Link and Google Ads are leading examples.
Billing is usually pay-per-click. Impressions alone cost nothing. Cost is charged on a cost per click (CPC) basis only when a click occurs. To assess impression efficiency, cost per mille (CPM) is also a useful reference.
Ad rank is not decided by bid alone. A combined score of ad quality and landing page relevance also factors in. At the same bid, higher quality wins top placement at lower cost.
Difference From SEO
| Category | Search Ads (SA) | SEO |
|---|---|---|
| Placement | Paid | Organic search (free) |
| Time to effect | Immediate | Builds over months |
| Durability | Stops when budget stops | Content remains as an asset |
Search ads claim the top spots fast. But the moment the budget stops, so does exposure. SEO takes time, yet content accumulates as an asset.
The two are complementary, not competing. Use search ads to validate new keywords quickly. Then connect validated keywords to content SEO for long-term exposure.
Performance Metrics
Search ads target the moment of clear search intent. That gives them relatively high conversion efficiency. The key metrics are:
- Click-through rate (CTR): ad copy and keyword relevance
- Cost per click (CPC): cost of a single click
- Return on ad spend (ROAS): revenue efficiency against ad spend
- Conversion rate: actual conversion after landing-page arrival
More clicks won't produce results if the landing page is weak. Optimize the ad and the page as one unit.
Notes
Search ad prices rise as competition intensifies. With short-term clicks alone, customer acquisition cost (CAC) can easily exceed customer lifetime value (LTV).
238lab designs a structure that captures short-term demand through search ads while building long-term exposure through SEO and generative engine optimization (GEO).