What is Podcasting?
  Podcasting is delivering audio content to iPods and other portable media players on demand, so that it can be listened to at the user's convenience. The main benefit of podcasting is that listeners can sync content to their media player and take it with them to listen whenever they want to. Because podcasts are typically saved in MP3 format, they can also be listened to on nearly any computer.

  Lastly, it's important to note that you do not need an iPod or any other portable media player to enjoy podcasts. The name podcasting can be confusing in that regard. The only requirement is a computer with an Internet connection and a set of speakers or headphones.