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Ipod is a brand of portable media players designed and marketed by Apple inc. and launched on October 23, 2001 (2001-10-23). The product line-up includes the hard drive-based iPods classic, the touchscreen iPods touch, the video-capable iPods Nano, and the compact iPods Shuffle. The iPhone can function as an iPod but is generally treated as a separate product. Former iPod models include the iPods Mini and the spin-off iPods photo (since reintegrated into the main iPod Classic line). iPod Classic models store media on an internal hard drive, while all other models use flash memory to enable their smaller size (the discontinued Mini used a microdrive miniature hard drive). As with many other digital music players, iPods, excluding the iPod Touch, can also serve as external data storage devices. Storage capacity varies by model.

Apple's iTunes software can be used to transfer music to the devices from computers using certain versions of Apple machintosh andMicrosoft Windows operating systems.For users who choose not to use Apple's software or whose computers cannot run iTunes software, several open source alternatives to iTunes are also available. iTunes and its alternatives may also transfer photos, videos, games, contact information, e-mails settings, Web bookmarks, and calendars to iPod models supporting those features. Apple focused its development on the iPod line's unique user interface and its ease of use, rather than on technical capability. As of September 2008^[update], more than 173 million iPods had been sold worldwide, making it the best-selling digital audio players series in history.

The iPod line came from Apple's "digital hub" category, when the company began creating software for the growing market of personal digital devices. Digital cameras, camcorders and organizers had well-established mainstream markets, but the company found existing digital music players "big and clunky or small and useless" with user interfaces that were "unbelievably awful," so Apple decided to develop its own. As ordered by CEO Steve jobs, Apple's hardware engineering cheif John Robinstein assembled a team of engineers to design the iPod line, including hardware engineers Tony Fadell and Micheal dueay, and design engineer Jonathan Eve. The product was developed in less than one year and unveiled on 23 October 2001. Jobs announced it as a Mac-compatible product with a 5 GB hard drive that put "1,000 songs in your pocket."

Apple did not develop the iPod software entirely in-house, instead using portal player's reference platform based on 2 ARM cores. The platform had rudimentary software running on a commercial microkernel embedded operating system. PortalPlayer had previously been working on an IBM-branded MP3 player with bluetooth headphones. Apple contracted another company, Pixo, to help design and implement the user interface under the direct supervision of Steve Jobs. As development progressed, Apple continued to refine the software's look and feel. Starting with the iPods Mini, the Chicago font was replaced with Espy sans. Later iPods switched fonts again to Podium sans-a font similar to Apple's corporate font,Myriab. iPods with color displays then adopted some Mac OS X themes like Aqua progress bars, and Brushed Metal meant to evoke a combination look. In 2007, Apple modified the iPod interface again with the introduction of the sixth-generation iPods classic and third-generation iPods Nano by changing the font to Helvetica and, in most cases, splitting the screen in half by displaying the menus on the left and album artwork, photos, or videos on the right (whichever was appropriate for the selected item).

In September 2007, during the course of a lawsuit with patern Holding Compony Burst.com, Apple drew attention to a patent for a similar device that was developed in 1979. Kane Kramer patented the idea of a "plastic music box" in 1979, which he called the IXI. He was unable to secure funding to renew the US$ 120,000 worldwide patent, so it lapsed and Kramer never profited from his idea. Kramer is now in talks with the company to discuss how he will be reimbursed.

User Interface.

iPods with color displays use anti-aliased graphics and text, with sliding animations. All iPods (except the iPods shuffle and iPods Touch) have five buttons and the later generations have the buttons integrated into the click wheel—an innovation that gives an uncluttered, minimalist interface. The buttons perform basic functions such as play, next track, and previous track. Other operations such as scrolling through menu items and controlling the volume are performed by using the click wheel in a rotational manner. The iPods shuffle does not have a click wheel and instead has five buttons positioned differently from the larger models. The iPods Touch has no click-wheel. Instead it uses a 3.5" touch screen in addition to a home button, sleep/wake button and (on the second generation iPod touch) volume up and down buttons. The user interface for the iPod touch is virtually identical to the iPhone. Both devices use the iPhone OS.

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