ITR-V is a one page acknowledgement / receipt of the income tax return filed by you. It needs to be signed and sent to Income Tax Office at Bengaluru. These days electronic verification option has also been given under which hard copy is not required to be sent.
A specimen of Acknowledge generated after successful filing of ITR Form / Income tax return has been attached herewith for your reference.
Read more : A Simple Guide To E-Verify Your Return