News feeds are a way to quickly show you updates from a website by feeding information to a news reader program that is installed on your computer. They can also be called RSS which stands for 'Really Simple Syndication'.
The news reader that you download depends on your operating system. IE 7.0 and Safari have built in support for RSS, but you can also download a reader. Here is an article from Microsoft that will help you to determine the best RSS reader for you. For Firefox users, here are the recommended RSS readers.