iTunes is a media player computer program, used for playing, downloading, saving, and organizing digital music and video files on desktop or laptop 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 10.5.3, 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.

Noun

channel (plural channels)

1. The physical confine of a river or slough, consisting of a bed and banks.

   The water coming out of the waterwheel created a standing wave in the channel.

2. The natural or man-made deeper course through a reef, bar, bay, or any shallow body of water.

   A channel was dredged to allow ocean-going vessels to reach the city.

3. The navigable part of a river.

   We were careful to keep our boat in the channel.

4. A narrow body of water between two land masses.

   The English Channel lies between France and England.

5. (electronics) A connection between initiating and terminating nodes of a circuit.

   The guard-rail provided the channel between the downed wire and the tree.

6. (electronics) The narrow conducting portion of a MOSFET transistor.
7. (communication) The part that connects a data source to a data sink.

   A channel stretches between them.

8. (communication) A path for conveying electrical or electromagnetic signals, usually distinguished from other parallel paths.

   We are using one of the 24 channels.

9. (communication) A single path provided by a transmission medium via physical separation, such as by multipair cable.

   The channel is created by bonding the signals from these four pairs.

10. (communication) A single path provided by a transmission medium via spectral or protocol separation, such as by frequency or time-division multiplexing.

    Their call is being carried on channel 6 of the T-1 line.

11. (broadcasting) A specific radio frequency or band of frequencies, usually in conjunction with a predetermined letter, number, or codeword, and allocated by international agreement.

    KNDD is the channel at 107.7 MHz in Seattle.

12. (broadcasting) A specific radio frequency or band of frequencies used for transmitting television.

    NBC is on channel 11 in San Jose.

13. (storage) The portion of a storage medium, such as a track or a band, that is accessible to a given reading or writing station or head.

    This chip in this disk drive is the channel device.

14. (technic) The way in a turbine pump where the pressure is built up.

    The liquid is pressurized in the lateral channel.

15. (business, marketing) A distribution channel
16. (Internet) A particular area for conversations on an IRC network, analogous to a chatroom and often dedicated to a specific topic.
17. (Internet) An obsolete means of delivering up-to-date Internet content.
    • 1999, Jeffrey S Rule, Dynamic HTML: The HTML Developer's Guide

      Netcaster is the "receiver" for channels that are built into Netscape 4.01 and later releases.

    • 1999, Margaret Levine Young, Internet: The Complete Reference

      To access channels in Windows 98, you don't have to go any farther than your desktop.

• (narrow body of water between two land masses) passage, sound, strait
• (for television) side (dated British, from when there were only two channels), station (US)