I found this on Google by using the define: syntax & searching rss it's only a quick explanation!
Quote:
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RSS - (Rich Site Summary or RDF [Resource Description Framework] Site Summary). An XML format for sharing content among different Web sites such as news items. How does it work? A Web site can allow other sites to publish some of its content by creating an RSS document and registers the document with an RSS publisher. A web publisher can post a link to the rss feed so users can read the distributed content on his/her site. Syndicated contentcan can include news feeds, listings of events, stories, headlines, etc.
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Source:
http://mason.gmu.edu/~montecin/netterms.htm
I hope this helps!