Citi lets you earn ThankYou Points through various credit cards. Even the Citi Custom Cash Card and the Citi Double Cash Credit Card, both marketed as cash back cards, are linked to the Citi ThankYou Rewards program. The card you get, the bonus categories it comes with and your spending habits affect how quickly you earn points.
The value of Citi ThankYou Points varies based on the redemption method you choose. For example, you usually get better value by transferring them to an airline partner instead of using them to shop online. In most cases, you can expect to get 0.5 cents to 1 cent per point. This is about average if you compare the value you get through the Citi ThankYou Rewards program with rewards programs run by other credit card issuers.