1) A month-long interest free loan. That's a nice-to-have.
2) Benefits - purchase protection, extended warranty, return protection, travel insurance, rental car insurance, free checked bag, etc.
3) Earn cash/miles on purchases.
4) Ease-of-use, I don't have to go to the ATM and take out cash. Sure, I can use a debit card, but that's giving someone access to my checking account, with a credit card I'm playing with someone else's money, I don't have to worry about my mortgage bouncing if there's unauthorized charges, for example.
2) Benefits - purchase protection, extended warranty, return protection, travel insurance, rental car insurance, free checked bag, etc.
3) Earn cash/miles on purchases.
4) Ease-of-use, I don't have to go to the ATM and take out cash. Sure, I can use a debit card, but that's giving someone access to my checking account, with a credit card I'm playing with someone else's money, I don't have to worry about my mortgage bouncing if there's unauthorized charges, for example.
5) Sometimes required when renting a car.