RSS stands for "Really Simple Syndication" -- it's a format for sharing content from sources across the Web. You subscribe to your favorite websites and get the latest headlines, without having to visit the site in your web browser.
Just like when you want to watch a video clip or listen to music on the web, you need a "player" or "news readers" to subscribe to feeds. Most of these tools are free, and there are many to choose from, so you can find the one that best suits you.
You may also subscribe to our news feeds about specific areas: