Starting in 2005, Apple expanded on the core music features of iTunes with support for digital video, podcasts, e-books, and mobile apps purchased from the iOS App Store.

With the 2003 addition of the iTunes Store for purchasing and downloading digital music, and a version of the program for Windows, it became a ubiquitous tool for managing music and configuring other features on Apple's line of iPod media players, which extended to the iPhone and iPad upon their introduction. Originally announced by Apple CEO Steve Jobs on January 9, 2001, iTunes' original and main focus was music, with a library offering organization and storage of Mac users' music collections. Options for sound optimizations exist, as well as ways to wirelessly share the iTunes library. Developed by Apple Inc., it is used to purchase, play, download, and organize digital multimedia, on personal computers running the macOS and Windows operating systems, and can be used to rip songs from CDs, as well as play content with the use of dynamic, smart playlists. ITunes ( / ˈ aɪ t( j) uː n z/) is a software program that acts as a media player, media library, mobile device management utility, and the client app for the iTunes Store.

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