iTunes Store

The iTunes Store is an online business run by Apple Inc. which sells media files that are accessed through its iTunes application.Opening as the iTunes Music Store on April 28 2003, it proved the viability of online music sales. As of July 2007, the store has sold 3 billion songs, accounting for more than 80% of worldwide online digital music sales. Most downloaded files come with restrictions on their use, enforced by FairPlay, Apple's version of digital rights management.
See more at Wikipedia.org...