Virtual cards serve a variety of purposes:

1. Security: A virtual card is a unique card number associated with your account but different from your actual physical card number. This helps protect your card details from being exposed to a data breach.
2. Online Shopping: Virtual cards are ideal for online purchases, subscriptions, and sign-ups where you may want to provide something other than your primary card details. If a data breach occurs, only the virtual card information is compromised, leaving your main card and account safe.
3. Control Over Spending: Some virtual cards allow you to set spending limits, which can be a handy budgeting tool. You can also specify the time frame during which the card can be used, adding another control layer.
4. Single/Multi-Use: Some virtual cards are designed for single use, and the card number becomes invalid after a transaction is completed. Others can be used multiple times until you decide to cancel them.
5. Convenience: Virtual cards are available immediately upon issuance, eliminating the need for a physical card to arrive in the mail.
6. Fraud Prevention: If a virtual card number is stolen, the thief won't have access to your main account details, and the virtual card can easily be canceled without affecting your main card.

Remember, while virtual cards offer numerous advantages, they are not a complete solution for fraud or overspending. Monitoring your transactions regularly, keeping your devices secure, and practicing good online security habits are still important.