What is an RSS feed?
Luckily, there are some very nice people out there who can explain things in easy to understand language:
RSS Feed Readers
To make use of an RSS feed you need a feed reader. A feed reader can take the form of a program to download for your computer, a browser extension or a website.
There is a fairly comprehensive list on Wikipedia. (Don't be put off by the fact Wikipedia calls them feed aggregators - it's the same thing.)