Card verification value (CVV) is to provide added security when making purchases over the internet. CVV is the three-digit number printed on the back of the card. It helps to verify that you are in possession of the card because the code shouldn’t be known to anyone else except you, as the card holder. It is also a way of counteracting credit card fraud.
Many online retailers require a CVV for purchases, which means they are actively working to prevent fraudulent transactions occurring on their site.
When purchasing an item or service in person, never provide the details of your CVV. Retailers or service providers do not need to request the CVV. If someone asks you for it, be highly suspicious and do not give it out.