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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. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. All three models were released in 2005. 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,