These offers are called sign up bonuses and they are designed to reward new cardholders. A typical example is spending $500 to $1,000 in three months and receiving $200 back as a statement credit or cash deposit. Approval depends on your credit profile and income, and you usually cannot have received a bonus from the same card issuer recently. The key is paying the balance in full so interest does not erase the reward. When used correctly, this approach can add value without adding debt.