RSS defines an easy way to share and view headlines and content
RSS files can be automatically updated
RSS allows personalized views for different sites
RSS is written in XML
Why use RSS?
RSS was designed to show selected data.
Without RSS, users will have to check your site daily for new updates. This may be too time-consuming for many users. With an RSS feed (RSS is often called a News feed or RSS feed) they can check your site faster using an RSS aggregator (a site or program that gathers and sorts out RSS feeds).
Since RSS data is small and fast-loading, it can easily be used with services like cell phones or PDA's.
Web-rings with similar information can easily share data on their web sites to make them better and more useful.