Podcasts can be used for these file types: .mp3 (audio), .m4v (video)
A podcast is a series of audio or video files that can be downloaded and played on a computer or personal media device, such as an mp3 player. The audio files in a podcast are typically published as a series of episodes. Your audience can listen to a single episode, or subscribe to the entire podcast series so that new episodes are automatically downloaded to their computer, which can then be transferred to a personal media device.
If you are considering a podcast, consider the length and size of your episodes: