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The CVV (or CVC, CID, or CVV2, depending on your card issuer) is a three- or four-digit security code printed on your credit or debit card. It exists for one reason: to verify that you physically possess the card when you're making a purchase—especially online or by phone, where the merchant can't see the card itself.
On most Visa, Mastercard, and Discover cards, the CVV is a three-digit number printed on the back of your card, to the right of the signature strip. American Express cards are different: their four-digit code (called the CID) appears on the front of the card, above the account number on the right side.
If you can't locate it, check your card's back or front near the account number. If you still don't see it, your card issuer can confirm its location.
When you shop online or over the phone, the merchant never handles your physical card. They get your card number, expiration date, and billing address—but not the CVV. That's intentional.
The CVV serves as proof you have the actual card in your possession. A fraudster with only your card number (stolen from a data breach, for example) cannot complete a purchase online without this code. It's a friction point that stops many fraud attempts before they happen.
This is why you should never share your CVV via email, text, or phone unless you initiated a legitimate transaction with a company you trust.
People sometimes confuse CVV with PIN (Personal Identification Number), but they serve different purposes:
| CVV | PIN |
|---|---|
| Three or four digits on the card itself | Four to six digits you create or receive |
| Used for card-not-present transactions (online, phone, mail) | Used at ATMs and in-store checkout terminals |
| Static—printed on the card | Confidential—only you should know it |
| Merchants may see it during checkout | Merchants never see your PIN |
CVV reduces fraud, but it's not foolproof. Here's what to understand:
What it protects: It prevents someone with only your card number from making online purchases without your knowledge.
What it doesn't protect: If a fraudster has your physical card, they have your CVV too. CVV also doesn't protect you against data breaches at merchants' websites—if a company's payment system is compromised, the CVV may be stolen alongside other card details.
The CVV is one layer in a multi-layered security system that also includes fraud monitoring, encryption, and chargeback protections.
Legitimate merchants request your CVV during:
Avoid merchants who seem to store your CVV after a transaction—many regulations discourage this practice. Most reputable companies process your payment but don't retain the CVV for future charges.
Never provide your CVV if:
Legitimate companies won't ask for sensitive information through unsecured channels.
While the CVV itself is a built-in safeguard, you're responsible for the broader picture:
The strength of the CVV system depends on both how merchants handle it and how carefully you protect your card and account information.
