Basically that is for the people who run websites or have websites. You can take an "RSS" feed from my site and post the news on your site without having to do anything but insert the code. Also you can subscribe to a feed and your browser automatically updates the feed with current news. Sames as viewing website just a different format. The most usefullness of a feed is if you have a web capable cell phone, you can log on and view the feeds. Text only, no pictures and formatted to view on a small cell phone screen.
If you click on the first RSS emblem, RSS 0.91, it will bring up a basic formatted text, then in top title bar there is a "WHat is a RSS Feed" lots of good information there too.
Jon