Podcasting is an internet-based method for broadcasting a series
of audio or video content to a group of subscribers. One uses a
software application, called a podcatcher, to subscribe. Once
subscribed, the podcatcher periodically checks the subscription
for new content, and automatically downloads any content it
finds to the subscribers’ computer. Many podcatchers will also
add the content directly to an MP3 player, such as an iPod.  The
only things you need to get started listening to podcasts are a
computer (the MP3 player is optional, and does not have to be an
iPod), an internet connection, and a podcatcher.   Enhanced
PodcastsEnhanced podcasts use Apple’s .mp4 audio file format and
can include extra information in a podcast episode including
chapters, images, and web links.  Chapters allow users to move
to different points in the episode. Please note: enhanced
podcasts can only be played using iTunes or an iPod.   Video
Podcasts Video, as well as audio, can be delivered and
subscribed to, as a podcast.