Podcasting is different from broadcasting and webcasting in that it "casts" audio not by a mechanism of centrally pushing audio out to listeners, but by the mechanism of the (distributed) listeners pulling (downloading) the audio files automatically. Podcasters publish (or "podcast") audio files, even in the likeness of radio shows, but it is the individual listener who initiates the "cast" through their subscription and automatic download of the audio program. Podcasting also utilizes the combination of audio files and RSS to publish descriptive data and metadata associated with the audio. RSS files used in podcasting include dates, titles, descriptions, and links to audio files. These links to audio files within RSS, which are used by podcasting applications, are defined by the enclosure elements in RSS 2.0 and RSS 1.0 (RDF), and all of the original podcasting proper applications were built to work with RSS 2.0.