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A CVV number (Card Verification Value) is a three- or four-digit security code printed on your credit card. It's designed to verify that you physically possess the card during a transactionâespecially when you're shopping online or over the phone, where the merchant can't swipe your card in person.
You'll find it in different locations depending on your card type. On Visa, Mastercard, and Discover cards, it's a three-digit code on the back, usually printed to the right of the signature strip. American Express cards display a four-digit code on the front, above the account number.
When you enter your card details online, the merchant requests your CVV to confirm you have legitimate access to the physical card. This adds a layer of protection beyond just knowing your card number and expiration date. The merchant sends this code to your card issuer (your bank or credit card company) for verification, butâimportantlyâmerchants are not supposed to store your CVV after the transaction completes. This rule is part of the Payment Card Industry Data Security Standard (PCI DSS).
| Feature | Purpose | Location |
|---|---|---|
| Card Number | Identifies your account | Front of card |
| Expiration Date | Shows when card expires | Front of card |
| CVV | Verifies physical possession | Back (or front, AmEx) |
| Chip/EMV | Encrypts in-person transactions | Embedded in card |
| Name | Identifies cardholder | Front of card |
The CVV is specifically designed to protect against card-not-present fraudâsituations where someone uses your number without having the physical card. If a fraudster knows only your card number and expiration date (say, from a data breach), they typically can't complete an online purchase without also knowing the CVV.
You'll provide your CVV whenever you enter card details without physically swiping or inserting the card:
You won't need it for in-person transactions at stores or ATMs, where the chip or magnetic stripe handles verification instead.
Never share your CVV over the phone unless you've initiated the call to a trusted merchant. Legitimate companies will never ask for it via email or text. Be cautious when entering it on websitesâensure the URL shows "https://" (secure connection) and look for a padlock icon in your browser.
If someone gains access to your CVV along with your other card details, report it to your card issuer immediately. Most issuers will cancel the card and issue a replacement at no cost to you.
Your CVV is one of several security layers protecting your card, but it works best when paired with your own vigilance about where and how you share your information.
