podcast (or non-streamed webcast) is a series of digital media files (either audio or video) that are released episodically and often downloaded through web syndication. The word usurped webcast in common vernacular, due to rising popularity of the iPod and the innovation of web feeds.

The mode of delivery differentiates podcasting from other means of accessing media files over the Internet, such as direct download, or streamed webcasting. A list of all the audio or video files currently associated with a given series is maintained centrally on the distributor’s server as a web feed, and the listener or viewer employs special client application software known as a podcatcher that can access this web feed, check it for updates, and download any new files in the series. This process can be automated so that new files are downloaded automatically. Files are stored locally on the user’s computer or other device ready for offline use, giving simple and convenient access to episodic content. Commonly used audio file formats are Ogg Vorbis and MP3. In many respects, this is closer to traditional publishing models associated with books and magazines (as opposed toradio, which uses a live stream).

Academics at the Community, Journalism & Communication Research group at the University of Texas at Austin in the USA are proposing a four-part definition of a podcast: A podcast is a digital audio or video file that is episodic; downloadable; programme-driven, mainly with a host and/or theme; and convenient, usually via an automated feed with computer software.

Podcasting can be used for:

1. Self-Guided Walking Tours - Informational content.

2. Music - Band promotional clips and interviews.

3. Talk Shows – Industry or organizational news, investor news, sportscasts, news coverage and commentaries.

4. Training - Instructional informational materials.

5. Story – Story telling for children or the visually-impaired.

Podcasting is the syndication of audio files using RSS. Podcasting works the same as a standard RSS feed reader or news aggregator, the only difference is that the feed you subscribe to contains an audio file in it. Instead of reading content in your RSS feed reader or aggregator, you can listen to the contents of your feed using a reader or aggregator that supports podcasting, or you can listen to them on an iPod or similar device. While podcasting was named for the iPod, you do not have to have an iPod to listen to a podcast. Podcasts can be displayed on websites with clickable links to audio files and many of the standard RSS readers, like FeedDemon’s latest beta, have begun supporting audio enclosures.

The audio file that makes the feed a podcast rather than a standard RSS feed is contained in the ‘enclosure’ tag. The easiest way to think of this is as an e-mail attachment.

Although the “enclosure” tag is not new to RSS feeds and has been included in the RSS v2.0 specification for about four years, podcasting has only really been around since August of 2004.

Webmasters are finding creative ways to provide media-rich content. The syndication aspect and potential increase in audience size are an attractive lure. Listeners benefit from podcasting because, like RSS, podcasting is a means to publish content that ultimately gives the recipient the control over the information they want to see or hear.

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