SEA (Search Engine Advertising) refers to paid advertisements on search engines, primarily Google.
To appear in specific search results, companies place ads that are then prominently displayed—labeled as such—above or below the organic search results.
With traditional search ads, costs are often incurred when the ad is clicked, while simply displaying the ad usually doesn’t cost anything. An auction that takes place in a fraction of a second determines which ad appears where. This process considers not only the bid but also, among other factors, the quality and relevance of the ad and landing page, as well as the context of the specific search. Incidentally, those who run high-quality and relevant ads often pay less per click than those with lower-quality ads.