They are for Apps, Music, Face time (ONLY ON 4G) And more!!
As for iPods, Yes. But there are many other companies that make MP3 players, the difference is that a MP3 player is just for music, where ipods can multi-task.
on an ipod, you can listen to radio music or your own music, play games, and more but a radio can only listen to music
All iPods are designed in California and assembled in China. They are sold all around the world.
iTunes, because iTunes is the official resource for music for an iPod. And virtually the only way to get music onto your iPod legally. iTunes is made by the same company, and is made just for iPods, so the quality is the best you can get on an iPod.
Many people around the world have ipods and buy ipods because it's the best music player around.
I believe that ipods are a waste of time and encourage people to illegally download music.
iPods can only play music, except for the iPod touch. The iPod touch does not run mac OS X, it runs on its own mobile version for everything. iPods are not computers, they are music players.
Listen to YouTube.com
Linux software exists to sync music with most iPods. So yes.
Only if it is and MP3 file that is DRM free. If Napster offeres that yet I'm not sure.
No they are different sizes for 1 and ipods look different to mp3's. These are only a few so anyone can do a better answer.