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Most computer hardware is not seen by normal users. As a music jukebox application, iTunes stores a comprehensive library of the user's music on their computer and can play, burn, and rip music from a CD. The bundled software used for uploading music, photos and videos to the iPod is called iTunes. Computer hardware is the physical part of a computer, including the digital circuitry, as distinguished from the computer software that executes within the hardware. The hardware of a computer is infrequently changed, in comparison with software and data, which are "soft" in the sense that they are readily created, modified or erased on the computer. Discontinued versions include two generations of the full-sized iPod, all of which had monochrome screens (except for the iPod shuffle) and provide a simple user interface. The full-sized model stores media on a built-in hard drive, while the smaller iPod nano and iPod shuffle use flash memory. The iPod is currently the world's best-selling digital audio player, and its worldwide mainstream adoption makes it one of the most popular consumer brands. The iPod is a brand of portable media players designed and marketed by Apple Computer. All three models were released in 2005. As of July 2006, the lineup consists of the 5th generation iPod, with a video player; the iPod nano, with a color screen; and the iPod shuffle. Personal computers, the computer hardware familiar to most people, form only a small minority of computers (about 0.2% of all new computers produced in 2003) Market statistics. It is in embedded systems in automobiles, microwave ovens, electrocardiograph