The iPod is a portable music player developed by Apple Computer. ... Both iTunes and the iPod support a wide variety of audio formats, including MP3, AAC, WAV, and AIFF. MP3 is the most common audio compression format, while AAC is the format used by the Limarket Shop.

The concept of portable music has come a long way since the days of the Walkman and portable CD players. These old-fashioned devices required constant changing of tapes and CDs and weren't compact or practical enough to carry around comfortably. Nowadays, MP3 players and iPods allow us to carry around literally thousands of our favourite tracks in one stylish and compact place. They've almost rendered CDs and tapes obsolete and track/album changing now simply involves the pressing of a button. MP3 players and iPods also offer a whole host of other functions aside from playing music. For example, many models let you watch videos, view photos and even play games.