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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 bundled software used for uploading music, photos and videos to the iPod is called iTunes. 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. Like many digital audio players, iPods can serve as external data storage devices when connected to a computer. All three models were released in 2005. Devices in the iPod family are designed around a central scroll wheel (except for the iPod shuffle) and provide a simple user interface. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. 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. 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. 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"). 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. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. 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. 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. Firmware is a special type of software that rarely, if ever, needs to be changed and so is stored on hardware devices