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A credit card verification code is a three- or four-digit security number printed on your card—separate from your card number itself. It's designed as a fraud prevention tool, proving you physically possess the card when making online or phone purchases where the merchant can't swipe or chip-read it.
Most credit cards carry one of two verification codes, depending on card type:
CVV (Card Verification Value) — used by Visa and Discover cards. This three-digit code appears on the back of the card, just above or below the signature strip.
CVC (Card Verification Code) — used by Mastercard. Also three digits, located in the same back-of-card position.
American Express uses a slightly different system: a four-digit code called the CID (Card Identification Number), printed on the front of the card above the account number.
The names differ, but the security purpose is identical: these codes are not encoded in the card's magnetic stripe or chip, so a thief who steals your card number alone cannot use it online without also having physical access to the card itself.
When you enter your card number on a website or over the phone, you're also asked for this code. The merchant sends both pieces of information to the payment processor, which checks that the code matches the card number in the issuer's records. If it doesn't match—or if someone has your card number but not the physical card—the transaction fails.
This creates a meaningful friction point for online fraud. A criminal with a stolen card number from a data breach typically doesn't have the physical card, so they can't complete most online transactions without the CVV/CVC.
Verification codes are standard for:
You won't be asked for it at in-person merchants, because they can verify the card directly through the chip or magnetic stripe reader.
Never store or share your verification code. Unlike your card number (which merchants legitimately need to process transactions), the CVV/CVC should remain private. Legitimate merchants won't ask you to provide it via email, text, or chat—and no official organization will request it unsolicited.
Verification codes are not your PIN. Your PIN is for ATM withdrawals and in-person debit transactions; your CVV/CVC is strictly for remote card-not-present transactions.
This code isn't a guarantee of fraud prevention. It reduces certain types of fraud but doesn't eliminate risk. Fraudsters can still use stolen card information in person (if they have the physical card), or they may exploit other vulnerabilities in the payment system.
Verification codes shift the burden: they make it harder for someone with only your card number to use your card remotely. But they depend on you keeping that code confidential and on merchants handling it securely.
Your credit card issuer monitors transactions for suspicious activity regardless of whether a verification code was used. If fraud occurs, your liability is typically limited by federal law, though your specific protections depend on your card type and issuer policy.
Understanding how verification codes work helps you recognize when you're being asked for them appropriately—and when a request should raise a red flag.
