RSS and Atom are versions (or flavors) of web feeds. Web feeds let subscribers know when a web site or blog they subscribe to has updated its content. Most subscribers use a feed reader (also called an aggregator or news reader, see image below) to collect all of their web feeds in one place. With the use of a feed reader you can see dozens of feeds and whether they’ve been recently updated. There are many places you can put and use your feed reader: on your web browser, on your desktop, through your email, or through mobile devices.