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A podcast is a type of digital media consisting of an episodic series of audio radio, video, PDF, or ePub files subscribed to and downloaded through web syndication or streamed online to a computer or mobile device. The word is a neologism derived from "broadcast" and "pod" from the success of the iPod, as audio podcasts are often listened to on portable media players. Another derivation of the word Podcast is believed to consist of Personal On Demand Broadcast.