iPod is a brand of digital media player series of devices designed and sold by Apple Computer (Hewlett-Packard also had to sell the product with the name Apple iPod + HP). The name "iPod" is also used to be a variant of the name of one digital media player in the circuit (this variant is now called "iPod classic"). Most of the variants of the iPod provides a user interface (user interface) is simple to use design in the form of steering wheel (scroll wheel). iPod classic stores its data on a hard drive, while other models use flash memory. As with most devices other music players, iPods can be used as an external hard drive when connected to a computer.