This article compares each iPod by its special features. One of the most popular model is the iPod 5G that comes with 30 or 80 GB storage capacity. It is not just an mp3 / mp4 player, you can store, view and share complete music videos, movies, podcasts, play games, share photos, playback music and videos, connect to a video output device, and much more. It can play your favorite music for up to 20 hours as this iPod boasts of higher battery life.  

The iPod Nano has many of the same features as the full-size iPod, but with much lesser storage capacity. It comes in 2 GB, 4 GB and 8 GB models. It has up to 24 hours of battery life and is comparatively lighter and smaller. It also suffers from some limitations; the iPod Nano doesn't support voice recording and media storage via third-party peripherals. iPod Nano is a great mp3 player for people who would just like to listen to audio files.
 
Apple's most-pocket friendly iPod is iPod Shuffle. It offers a host of advantages: it's affordable for everyone; its sound quality is as good as that of any other iPod; it has flash memory rather than a hard drive; and it's really portable. However, the disadvantage is that it doesn't include a screen for steering up to specific songs. It has a limited storage capacity, 512 MB to maximum 1 GB. So it's good for those who want to be in fashion, yet can compromise on memory space. But the size of this mp3 player is so small that you can easily clip it to your clothes.

With digital music being in-vogue, many portable jukeboxes hit the market, since Apple kick-started the music revolution of our time. Other portable MP3 and MP4 players, besides iPod, are available in the entertainment world of mp3 / mp4 players. There are many Chinese, Korean and Japanese brands manufacturing low cost players in bulk. These are much cheaper, but have their own set of advantages and disadvantages. The fact remains that iPods are the most popular among all, and hold the biggest share of this market. There are enough iPod users in the market and a lot of new things are getting developed around iPods.