SERP - Search Engine Results Pages are the pages displayed by search engines in response to a query by a user.

The main component of the SERP is the listing of results that are returned by the search engine in response to a keyword query.

• Featured snippets. Featured snippets show a snippet of content 
• Knowledge card. Knowledge Cards appear at the top of the SERP
• Knowledge Panel. Knowledge Panels provide information about the main subject
• Image Pack. Image Packs show a handful of thumbnails