An mp3 player is a portable music player which only supports a specific formatted musics. And ipod nano is also a portable music player but it includes extras like games, calendar, alarm clocks, and also you can upload pictures in it. Ipod is made by the brand name called Apple and it's more expensive than an mp3 player. The newest kind of ipod that came out is called the ipod nano video. It's a music player with more improved features and also you can watch videos in it.