A credit card can . Tide you over while you wait for cash from other sources. Be a lifesaver in emergencies. Serve as an ID, even if you don't use it for charging things. Help you build a good credit rating - if you make your payments on time.
Large balances can build up quickly.
Spell financial disaster if you get behind in your payments. Tips for Good Credit Carry only one card. Read the fine print. Beware of cash advances - most will carry a fee. Check out annual percentage rates.