Acronym for Really Simple Syndication, Resource Description Framework (RDF) Site Summary, or Rich Site Summary, depending on the source. A simple, structured XML format for sharing content among different Web sites. RSS documents include key metadata elements such as author, date, title, a brief description, and a hypertext link. This information helps a user (or an RSS publisher service) decide what materials are worth further investigation. Examples include news feeds, events lists, news stories, headlines, and excerpts from blogs and discussion forums.