Question

difference between Question and question tags ?

Answer 1

Question is an expression used to inquire or request information for something/someone.

Is this your pen? Is a question.

Question tag, however is a clause that can turn a simple statement into a question. 

This pen is yours, isn't it? Is a question tag.

Here the statement "This pen is yours" is converted into a question by adding "Isn't it?"

For better understanding,

Consider another example-

1) Are you Arjun? (Question) While-

   You are Arjun, aren't you? (Question Tag)

2) Do you love travelling? (Question)

    You love travelling, don't you? (Question tag)

Answer 2

this is rohan, isn't it? is question tag