ipod timeline.

Walkman is a Sony brand tradename originally used for portable audio cassette, and now used to market Sony's portable audio and video players as well as a line of Sony Ericsson mobile phones. The original Walkman introduced a change in music listening habits by allowing people to carry music with them. The device was built in 1978 by audio-division engineer Nobutoshi Kihara for Sony co-chairman Akio Morita, who wanted to be able to listen to operas during his frequent trans-Pacific plane trips.

MPEG-1 Audio Layer 3, more commonly referred to as MP3, is a patented digital audio encoding format using a form of lossy data compression. It is a common audio format for consumer audio storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on digital audio players. MP3 is an audio-specific format that was designed by the Moving Picture Experts Group as part of its MPEG-1 standard. The group was formed by several teams of engineers at Fraunh

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