Grand Theft Auto Online cards, also known as Shark Cards, are prepaid cards that add a specific amount of virtual currency (GTA$) to your in-game account.

Grand Theft Auto Online cards are used to add GTA$ to your in-game account, allowing you to purchase properties, vehicles, weapons, clothing, and other items.

This helps you progress faster in the game and acquire items that would otherwise require a significant amount of playtime to obtain.

To redeem a Grand Theft Auto Online card:

1. Log in to your Rockstar Games Social Club account.
2. Click the "Store" tab in the top right corner, then "Activate a Code."
3. Enter the card code and confirm.
4. The balance will be automatically added to your GTA Online account.