A podcast is a series of episodic audio files that the listener can download and hear. Podcasting often uses a subscription model, in which new episodes routinely downloaded through web syndication to the listener's computer, mobile device, or portable audio player. The podcast is delivered to the audience through audio format.
Videos shared following a podcast model are often referred to as video podcasts, blogs, or vodcasts. Essentially, a podcast is a popular free service that allows the user to pull from an MP3 file. The name podcast comes from a blending of the words iPod (a personal device that plays music made by Apple and broadcasting.)