The iTunes Store is an online business run by Apple Inc. which sells media files that are accessed through its iTunes application. Opened as the iTunes Music Store on April 28, 2003, it proved the viability of online music sales. The store now sells music videos, TV shows, movies, and video games in addition to music. Most downloaded files come with restrictions on their use, enforced by FairPlay, Apple's version of digital rights management.

iTunes delivers music files in M4P format (protected MPEG4-AAC).

TuneCab Media Converter can convert iTunes files to mp3 and other unprotected formats if you have valid licenses for playback of those files on your PC.