what

 pronoun

Essential Meaning of what

1—used to ask for information about someone or something  What is your name?

2—used to describe a question Please ask them what they want for dinner.

3—used to ask someone to say something again because you have not clearly heard or understood it  What did you say? = (informal) What?—often used to show surprise about the thing that someone has just said  "And then  "You said what?!"

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IF 

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If and whether are referred to as subordinating conjunctions, which means that they are elements that form sentences into word groups called, well, subordinate clauses. ... It can be at the beginning or end of a conditional sentence. If it doesn't rain, we will go.

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