CVV2/CVC2 is a three- or four-digit code on the back of the card, which is its security feature. It is located on the same strip as your signature. It is only on your card and in the bank’s system, which reduces the possibility of unauthorized payments. If you have such a code printed on your card, it means you can pay with it online. CVV2 and CVC2 are international standards.
Never share this number with anyone or take pictures of your card! An employee of a bank or any institution has no right to ask you for it! It is only used for payment authorization!