It’s for the cases when someone doesn’t physically have your card. Getting the 16 digit number and expiration date is fairly easy to a degree. It to get the CVV you need to physically have the card and see it. It’s just an extra layer of protection to ensure the person actually has the card.
It’s primarily used for what is called “card not present” transactions. When a merchant can’t verify you have a physical card. Such as an online payment.
Just one more layer of security. Nothing is perfect overall, nor is any layer of security alone perfect . But when you add up all the different layers it gets more and more difficult to cause issues.
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