There are three kinds of podcasts. Audio podcasts are usually an MP3 file and are the most common types of podcasts. Enhanced podcasts can have images to go along with the audio. They can also have chapter markers, making it easier to skip to different portions of an episode. Enhanced podcasts are an AAC file and are not supported by all devices. Video podcasts are movies, complete with sound. Video podcasts can be in a variety of formats, but MPEG-4 is the most popular.
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