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I have asked this question on StackOverflow. In the last line, I have asked the following question.

"Could anyone please explain how this method of 'tick()' works and what does it do? and Why?" According to this context which is the best way of asking this? "What does it do?" or "what it does?"

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It's wrong to say

Could anyone please explain ... what does it do?

You should say

Could anyone please explain ... what it does?

Here, "what it does" is not a question, it's a Noun Clause.

"What it does?" is not a proper question on its own. We don't see, for example, subject-auxiliary verb inversion in it.

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