iTunes is a media player computer program, used for playing, downloading, and organizing digital music and video files on desktop computers. It can also manage contents on iPod, iPhone, iPod Touch and iPad.

iTunes can connect to the iTunes Store to purchase and download music, music videos, television shows, iPod games, audiobooks, podcasts, movies and movie rentals (not available in all countries), and ringtones (only available on iPhone and iPod Touch 4th Generation). It is also used to download application software from the App Store for the iPhone, iPad and iPod Touch. iTunes has been criticized for not being able to transfer music from one portable device to another.

iTunes was introduced by Apple Inc. on January 9, 2001. The latest version, which is currently version 10.5, is available as a free download for Mac OS X v10.5 or later, as well as Windows XP or later. In June 2010, Apple released a new privacy policy pertaining to the capture and collection of users’ real-time location information. The information had been included in various device-specific EULAs since 2008, but was not included in Apple’s general privacy policy until 2010.

1. Basic: The Basic edition is the smallest version and enables a Microsoft Windows computer to play Matroska (MKV), MP4, Ogg and Adobe Flash video (FLV) files, in addition to various types of AVI files. It only consists of ffdshow (for audio and video decoding), DirectVobSub (for subtitle decoding), Codec Tweak Tool and four other minor components. This edition does not come with Media Player Classic.
2. Standard: The Standard edition includes all features of the Basic edition plus a DVD Video decoder, Media Info Lite and Media Player Classic Home Cinema. This edition enables DVD playback in Microsoft Windows. This package is recommended for normal users.
3. Full: The Full edition includes 31 additional components and four additional tools beyond those included in the Standard edition, as well as adding video encoding capabilities to Microsoft Windows PCs. However, no encoding or conversion tool is included in the package.