Podcasting or Radio

Podcasting

PODCASTING
A podcast is a media file which is distributed over the internet using syndication feeds, for playback on a portable media players and personal computers. A pod refers to a container of some sort and the idea of broadcasting to a container or pod correctly describes the process of podcasting.
Podcasting is an automatic mechanism whereby multimedia computer files are transferred from a server to a client, which pulls down XML files containing the Internet addresses of the media files. In general, these files contain audio or video, but also could be images, text, PDF, or any file type.
The content provider begins by making a file (for example, an MP3 audio file) available on the Internet. This is usually done by posting the file on a publicly available webserver; however, BitTorrent trackers also have been used, and it is not technically necessary that the file be publicly accessible. The only requirement is that the file be accessible through some known URL (a general-purpose Internet address). This file is often referred to as one episode of a podcast.