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All three models were released in 2005. 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. Most computer hardware is not seen by normal users. The most recent version of iTunes has video organization features. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. 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. 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. Firmware is a special type of software that rarely, if ever, needs to be changed and so is stored on hardware devices such as read-only memory (ROM) where it is not readily changed (and is therefore "firm" rather than just "soft"). 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. Computer hardware is the physical part of a computer, including the digital circuitry, as distinguished from the computer software that executes within the hardware. 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. Like many digital audio players, iPods can serve as external