What is podcasting?

A podcast is a series of digital media files, usually audio or video, that is downloadable via RSS feed (really simple syndication). The RSS delivery is what differentiates podcasts from direct file download or streaming. Software applications, known as 'pod catchers' (such as Apple iTunes), can automatically download new files when they are made available.

Still a bit confusing? Visit Podcasting Terminology and FAQ sections, and watch this

3 minute 'Podcasting in Plain English' Video
(if you are unable to see the video, go to youtube to watch it)