RSS is short for "Really Simple Syndication" and it is a method of sorting and displaying content from multiple sources. Whenever a website with an RSS feed is updated, links to the new content on that site are displayed on the RSS feed. Where ever that feed is placed, a link will be dynamically inserted into that page. What you can do with RSS is nearly endless.
If you have a list of websites which you love reading, you can set up a website or software program which reads updates on your chosen RSS feeds to display all of their newly posted content to a single source.