What does comment vous appelez-vous mean?

It means what is your name, said either to a group of people or to someone you respect. It literally means "How your called-you" but what that means if you break it down is "How are you called?" or "What do you call yourself?" Vous is additionally both the plural and formal form of you, so you would say this to a big group of people or to someone like a teacher or the president. 

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