A podcast is an audio file that you can download from the internet and listen to on a computer or mobile audio player for free. The term "podcast" combines the words "iPod" and "broadcast." But don’t let the term fool you: podcasts are playable on any mp3 player.
Podcasts can be downloaded from online directories, such as iTunes. After downloading a podcast, you can listen to it or, if it is part of a series, subscribe to it.
Simply downloading a podcast will bring up a single episode. By subscribing to a podcast, you will receive updates as new episodes become available. The updates are automatically downloaded into your iTunes—or other directory—through an RSS (Real Simple Syndication) feed.
For more information about podcasting, visit http://www.podcasting-tools.com/what-is-podcasting.htm.