RSS is an XML-based format (using the Resource Description Framework (RDF) - a language for representing information about resources in the World Wide Web) that allows the syndication of lists of hyperlinks, along with other information, or metadata, that helps viewers decide whether they want to follow the link. RSS allows a person's computer to fetch and understand the information, so that all of the lists that person is interested in can be tracked and personalized for them.
From : www.bytowninternet.com/glossary