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The app allowed users to purchase e-books from the i Tunes Store, manage them through i Tunes, and transfer the content to their i Pad.
In 2008, Apple introduced native mobile apps for its i OS operating system.
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".
It had features reminiscent of Facebook, including profiles and the ability to follow other users.
The Telegraph reported in November 2011 that Apple had been aware of a security vulnerability since 2008 that would let unauthorized third parties install "updates" to users' i Tunes software.
In its first week, customers bought more than one million songs.
It can also suggest purchases to fill out "holes" in the library.
i Tunes has received significant criticism for a bloated user experience, with Apple adopting an all-encompassing feature-set in i Tunes rather than sticking to its original music-based purpose.
Sound Jam MP, released by Casady & Greene in 1999, was renamed "i Tunes" when Apple purchased it in 2000.
"Smart playlists" are a set of playlists that can be set to automatically filter the library based on a customized list of selection criteria, much like a database query.
Multiple criteria can be entered to manage the smart playlist.