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Like many digital audio players, iPods can serve as external data storage devices when connected to a computer. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. The bundled software used for uploading music, photos and videos to the iPod is called iTunes. 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. 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. 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.