This site is a comprehensive rss reference detailing everything you need to know about RSS.
RSS is defined as Really Simple Syndication or Rich Site Summary. RSS files are formed as XML files and are designed to provide content summaries of news, blogs, forums or website content.
Users select the rss feeds (content) they wish to subscribe. The feeds are generally simple headlines and brief descriptions if the user is interested they can click to see additional information.
This document is aimed at publishers and content providers with the intention of introducing & explaining the concepts behind RSS and addressing some commonly expressed concerns. It is primarily intended for a non-technical audience who require an overview of RSS in order to allow them to make decisions regarding the possible use of the technology. However, the guidelines do provide recommendations for good practice, case studies on RSS production and links to tools and specifications which will provide useful starting points for those tasked with actually producing RSS feeds.