What does is mean (Ma ) in Ni Hao Ma!

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Hi, about (Ma ) in Ni Hao Ma, it is a mood word, used in questions.Usually, it placed at the end of a sentence.

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Ni Hao Ma =你好吗？= How are you or How do you do?

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ma is the modal words at the end to indicate a question . 
Sentences using tone to indicate doubt. 
su as 
he is here   --------Is he here? 
hi hao -----------------------ni hao ma ?

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"ma" is a modal praticle. It is used in interrogative sentence.
Ni hao ma?= How are you?

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"你好吗?" means "how are you!"