Audio (or audio and video) content specifically designed for synchronizing and playback on mobile audio players, such as Apple’s iPod and MP3 playback-enabled mobile phones. Much of this content is highly topical, derived from radio or TV broadcasts, and it is often free. Podcasts are an example of “sticky” content: listeners are encouraged to subscribe to a podcast “channel” that typically is updated with new content daily or weekly. See also mobisode.