SERP is an acronym for search engine results page. It is the page Google and other search engines display after someone performs a search.

There are three main elements to a search engine results page; (1) paid results or “advertisements,” (2) local results, maps and reviews, and (3) non-paid “organic” results.

Other things may appear on a search engine results page including, but not limited to, news, related questions, shopping results, and featured snippets.

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https://moz.com/learn/seo/serp-features