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A podcast (not to be confused or equated with Apple Inc’s iPod)
usually consists of a combination of audio and/or video that is made
available for download via syndication. It is this syndication aspect
of the delivery that separates a podcast from a file available for
download. The files are usually retrieved with software applications
(generically known as podcatchers) such as Apple’s iTunes so
that subscribers can listen at their convenience on devices that have
intermittent, slow, or are otherwise lacking Internet access. The
podcatcher reads an RSS feed (whose entries point to specific podcasts, usually sorted by date) to identify and retrieve the podcast.

Like the term broadcast, podcast can refer either to the content itself or to the method by which the content is syndicated; the latter is also called podcasting. A podcaster is the person who creates the content.

A podcast is syndicated via an RSS feed. This feed enables distribution over the Internet by syndicated download. Though the same content may also be made available by direct download or streaming,
a podcast is distinguished from most other digital media formats by its
ability to be syndicated, subscribed to, and downloaded automatically when new content is added.

The term is a portmanteau of the words “iPod” and “broadcast”,^[1] the Apple iPod being the brand of portable media player for which the first podcasting scripts were developed (see history of podcasting).
Such scripts allow podcasts to be automatically transferred from a
personal computer to a mobile device after they are downloaded.^[2]

As more devices other than iPods became able to synchronize with podcast feeds, a backronym developed where podcast stood for “Personal On Demand broadCAST.”^[3][4][5] though such a definition would create a misnomer,
because podcasts are not available “on demand”; they are subscribed to
and usually received at set intervals. Such a definition would more
accurately describe a direct download or streaming media.

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http://extensions.joomla.org/extensions/search/1/podcast/

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