Listening to podcasts can help you stay up-to-date. A podcast is a simple yet sophisticated transfer of audio content over the Internet. Podcasts are usually MP3 audio files that are available for downloading onto your computer and transferred to an iPod or any portable digital-media device that can play MP3 files. Note that you do not need a portable digital-media device to listen to podcasts. MP3 files can be played right on your computer.