M3U ("MP3 URL" or "Moving Picture Experts Group Audio Layer 3 Uniform Resource Locator" in full) is a computer file format for a multimedia playlist. One common use of the M3U file format is creating a single-entry playlist file pointing to a stream on the internet. The created file provides easy access to that stream and is often used in downloads from a website, for emailing, and for listening to internet radio.
Although originally designed for audio files, such as MP3, it is commonly used to point media players to audio and video sources, including online sources. M3U was originally developed by Fraunhofer for use with their Winplay3 software, but numerous media players and software applications now support the format.
- M3U on Wikipedia