RSS stands for Really Simple Syndication. Microsoft provides an indepth explaination of of what RSS is. Basically, it is an xml formatted page that specific readers understand to download content from a website to your inbox, so you don't have to go to the website just to read the updates.
You simply look for websites with the all too comon picture. Once you have your news reader installed, you click on this link and subscribe to the feed.
So now you're probably wondering what is a news reader? Well, I typically look for ones that plug into Outlook. I want to have Outlook as my central information gathering program. I use NewsGator, but there are others like IntraVNews that are free. I use NewsGator myself. I can right click on the graphic and choose Subscribe in NewsGator. Newsgator analyzes the feed and boom, news articles start pouring into your Outlook.
Why don't you try to practice as I believe there is one of those graphics on this page. Can you find it?