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Like many digital audio players, iPods can serve as external data storage devices when connected to a computer. 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. Most computer hardware is not seen by normal users. The iPod is a brand of portable media players designed and marketed by Apple Computer. Discontinued versions include two generations of the iPod mini and four generations of the full-sized iPod, all of which had monochrome screens (except for the iPod shuffle) and provide a simple user interface. 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 most recent version of iTunes has video organization features. The bundled software used for uploading music, photos and videos to the iPod is called iTunes. All three models were released in 2005. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices.