The iPod is a portable media player designed and marketed by Apple and launched on October 23, 2001. As of June 2010, the product line-up includes the hard drive-based iPod Classic, the touchscreen iPod Touch, the video-capable iPod Nano, and the compact iPod Shuffle. Former iPod models include the iPod Mini and the spin-off iPod Photo (since reintegrated into the main iPod Classic line). iPod Classic models store media on an internal hard drive, while all other models use flash memory to enable their smaller size (the discontinued Mini used a Microdrive miniature hard drive). As with many other digital music players, iPods can also serve as external data storage devices. Storage capacity varies by model, ranging from 2andnbsp;GB for the iPod Shuffle to 160andnbsp;GB for the iPod Classic. They are a great way to listen to audio books.