The document discusses the Search Engine Results Page (SERP). When a user searches on the internet through search engines, the search engines return a SERP in response. A SERP contains a list of relevant website titles, descriptions, and URLs. It may refer to a single page of results or all matching links. There are three main components of a SERP - the searcher's query, organic listings, and paid listings. The searcher's query is what the user enters into the search box, typically 2-3 keywords or phrases. Organic listings are algorithmically determined based on relevance. Paid listings are advertisements that websites pay to appear in.