It tells people what village that ninja belongs to. They would have their clan symbol some where else on their body.
cloth and metal
cheat codes
You have to get a special pack Naruto/shippuden pack downloaded
Between $13 and 20$
Forehead protectors or headbands
You can get Naruto headbands in just about any store that sells cartoon stuff. Though the best places to get one is either at Hot Topic, or F.Y.E.
To show that they have foresaken their villages for the akatsuki.
Yes. They come in during the first movie. If you've seen it, then the people with the headbands with the dots are them. The ninjas Naruto's group fights, the ones that have the special armor, are snow ninjas.
Naruto Shippuuden 168
Naruto has ended, but Naruto Shippuden is still ongoing :)
There is no such character on Naruto.
It was invented when the creator was tired of drawing goggles. it was observed that there were goggles naruto wearing. Then the creator was tired drawing goggles, so he used headbands instead.