The original and main focus of i Tunes is music, with a library offering organization, collection, and storage of users' music collections.
It can be used to rip songs from CDs, as well as play content with the use of dynamic, smart playlists.
To compensate for the "boring" design of standard CDs, i Tunes can print custom-made jewel case inserts.
After burning a CD from a playlist, one can select that playlist and bring up a dialog box with several print options, including different "Themes" of album artworks.
Options for sound optimizations exist, as well as ways to wirelessly share the i Tunes library.
In 2005, Apple expanded on the core features with video support, later also adding podcasts, e-books, and a section for managing mobile apps for Apple's i OS operating system, the last of which it discontinued in 2017.
"Genius" transmits information about the user's library to Apple anonymously, and evolves over time to enhance its recommendation system.
It can also suggest purchases to fill out "holes" in the library.
In January 2010, Apple announced the i Pad tablet, and along with it, a new app for it called i Books.
On i OS, a dedicated App Store application served as the storefront for browsing, purchasing and managing applications, whereas i Tunes on computers had a dedicated section for apps rather than a separate app.
However, the following month, i Tunes 12.6.3 was also released, retaining the App Store, with 9to5Mac noting that the secondary release was positioned by Apple as "necessary for some businesses performing internal app deployments".
In its first week, customers bought more than one million songs.
In June 2011, Apple announced "i Tunes in the Cloud", in which music purchases were stored on Apple's servers and made available for automatic downloading on new devices.