RSS stands for Really Simple Syndication. Subscribing to an RSS feed removes the hassle of having to constantly visit a website to learn about what's new. It shows you the latest updates of selected topic as soon as it is published, and all in one place.
You will need an RSS reader to download and read your subscribed feeds, which include headlines and links to newly published content. An RSS reader can be web-based, desktop-based, or mobile-device-based.
Some of the popular RSS readers include:
Google Reader, NewsGator, Bloglines