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R

Router
A special-purpose computer (or software package) that handles the connection between 2 or more Packet-Switched networks. Routers spend all their time looking at the source and destination addresses of the packets passing through them and deciding which route to send them on.

RSS (Rich Site Summary or RDF Site Summary or Real Simple Syndication)
A commonly used protocol for syndication and sharing of content originally developed to facilitate the syndication of news articles, now widely used to share the contents of blogs.

RSS is an XML-based summary of a web site, usually used for syndication and other kinds of content-sharing.

There are RSS “feeds” which are sources of RSS information about web sites, and RSS “readers” which read RSS feeds and display their content to users.
RSS is being overtaken by a newer, more complex protocol called Atom.