From e-Learning Documentation
Podcasts allow students to access video/audio files using their computers, cell phone or mp3 players when they are not connected to the internet. They can listen on a plane, bus, or in a rural area with no coverage.
You will need to have your audio files in an MP3 format and video files in MP4 format for podcasting purposes. | Audacity is a free and easy to use software for creating audio files.