This page explains what RSS is. You will not yet be creating your own RSS files, but you will be seeing how RSS is commonly used. And seeing example RSS files for these common uses of RSS. You will also be getting a little history on RSS.
What is RSS?
The most popular version of RSS is an XML-based markup language used for syndication. Common uses of RSS syndication are for the syndication of news web sites, of blogs, of music, of video, or ####.
Short History of RSS
How RSS is Used Today