Suppose , that I have an object and I am describing how it works to other people. Which sentence of the below should I use? Why?
How does it work?
How it works?
Please give an explanation.
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If you have an iPhone 6, for instance, you can use both the sentences to describe its functionality. However, the approach will be different.
The second sentence does not form a complete question. You require the auxiliary verb 'does' to do that. But that as a sentence is okay. Let's use both the sentences in concern.
"Okay, this is iPhone 6. Now, the first question. How does it work?"
The second sentence is spoken when you directly tell that how that device works. There could be various ways you can use this.
"...blah...blah...blah... (after explaining the features)...so, this is how it works." OR,
"I'll tell you how it works."
Note that there is no question mark in the latter example.
Good explanation is here as Jenz tells in the comment.