Definition of Search Engine Advertising. Most search engines show ads alongside search results. The search query determines which ads are shown. Typically advertisers pay a fee every time someone clicks on their ad (Pay Per Click), as opposed to traditional advertising where they pay for the number of impressions.

Search engine marketing (SEM) is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results pages (SERPs) primarily through paid advertising.

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