Question

what
is interogative sentence

Answer 1

a sentence in which there is a question
it is called interrogative

Answer 2

Heya
Here is your answer
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Interrogative sentences are those sentences in which any type of question is asked

They begin with question words 
They ends with question mark

Most common example is 

What is your name?
In this sentence a question is asked that what is one's name

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Hope this helps! ^_^