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A podcast is a digital media file, or a series of such files, that is distributed over the Internet. In other words, a podcast is a collection of audio or video files residing at a unique web feed address. People can "subscribe" to this feed by submitting the feed address to an aggregator. When new "episodes" become available in the podcast they will be automatically downloaded to the users computer. Though podcasters' web sites may also offer direct download or streaming of their content, a podcast is distinguished from other digital media formats by its ability to be syndicated, subscribed to, and downloaded automatically, using an aggregator or feed reader capable of reading feed formats such as RSS (Really Simple Syndication) or Atom.