'How are you?' vs 'How do you do?'

[jon]

Which one is the correct?

how are you
How do you do?

Why gramatically?

Thanks
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(Feel free to correct mistakes in my post)

[tagarbo]

They are both correct. "How do you do" is more formal, and "How are you" is informal. You can also say "How are you doing".

[Yankee]

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"How do you do?" is basically limited to introductions. In other words, you can say it only once to someone (just after being introduced) and then never again. Instead of saying "How do you do?" you can also say "It's nice to meet you" or "Pleased to meet you."

"How are you?" is a standard greeting. If you see someone daily, you could say "How are you?" to that person every single day.
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Amy
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ESL teacher, translator, and a native speaker of American English