A SERP, or Search Engine Results Page, is the page displayed by a search engine in response to a user's query. It typically features a list of relevant web pages, advertisements, and other specialized results such as images, videos, or local business listings. The layout and content of a SERP can vary depending on the search engine and the nature of the query, but its primary purpose is to help users quickly find the most useful and authoritative information related to their search.