The Discover It card is a popular cash-back credit card offered by Discover Financial Services. It allows cardholders to earn cash back on their purchases, typically offering 5% cash back in rotating categories each quarter, such as groceries or gas, and 1% on all other purchases. Additionally, new cardholders often receive a sign-up bonus, which can double their cash back earned in the first year. The card has no annual fee, making it an attractive option for those looking to maximize rewards without incurring extra costs.