What Is Podcast

A 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 replaced webcast in common vernacular due to the fame of the iPod and its role in the rising popularity and 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 to radio, 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; program-driven, mainly with a host and/or theme; and convenient, usually via an automated feed with computer software.
Podcasting began to catch hold with the public in late 2004, though during the 1998 – 2001 dot-com era there were multiple "podcasts". Many individuals and groups including Dawn and Drew of The Dawn and Drew Show, Kris and Betsy Smith of Croncast and Dan Klass of The Bitterest Pill contributed to the early emergence and popularity of podcasts. Adam Curry, VJ, is credited with coming up with the idea to automate the delivery and syncing of textual content to portable audio players. The first application to make this process feasible was iPodderX, developed by August Trometer and Ray Slakinski. Since the 1930s there have been radio talk shows and news programs. Today, through the evolution of the internet capabilities, along with cheaper hardware and software, audio podcasts are doing what was historically done through radio broadcast stations.