A search engine results Page (SERP), is the listing of results returned by a search engine in response to a keyword query. The results normally include a list of items with titles, a reference to the full version, and a short description showing where the Keywords have matched content within the page. A SERP may refer to a single page of links returned, or to the set of all links returned for a search query.
Questions having the search-results tag regards the implementation and configuration of a search result page in SharePoint.
Reference: Wikipedia - Search engine results page