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Podcasting is a method of publishing media that includes a subscription option using an XML file. New "episodes" or tracks are made available through an RSS (Really Simple Syndication) XML file. This is called a feed. The feed contains references to media (called "enclosures") which feed aggregators, such as iTunes, can read and process.
Subscribing to Podcast Feeds
The simplest way to subscribe to podcasts is to use iTunes, but you can choose to listen to podcasts using a Web browser or other feed aggregators. Once subscribed in iTunes, you can easily access any episode from the feed or move the podcast episodes to your mobile device.