A method for delivering audio and video over the Internet. A standard podcast consists of an MP3 file uploaded to the web for listeners to download and listen to on a computer or portable MP3 player. The name comes from the Apple iPod, arguably the most popular portable audio player.
The difference between an ordinary MP3 and a podcast is that the podcast is set up to be accessed via an RSS feed, whether from your site, the iTunes site, or some other RSS host/directory server.
A podcast differs from streaming audio in which a file plays back from a server. With podcasting, the listener downloads the MP3 or MOV file onto their computer. The listener can then play it whenever convenient on his or her computer, or choose to transfer it to their audio player to listen while on the go.