What is the purpose of the headband in Naruto?

What is the purpose of the headband in Naruto? Shinobi headbands, also known as forehead protectors, are surprisingly important in the world of Naruto. Each one signifies loyalty to the ninja village they represent, which is why when a ninja decides to defect from their village, they sometimes scratch a line through the symbol they used to protect.

Shinobi headbands, also known as forehead protectors, are surprisingly important in the world of Naruto. Each one signifies loyalty to the ninja village they represent, which is why when a ninja decides to defect from their village, they sometimes scratch a line through the symbol they used to protect.
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