I have a few different credit cards.  Discover is the one I use the most.  All of my cards earn points for something.  But with Discover I earn cash back.  Every quarter they have special categories that you earn an extra 5% cash back on.  For example this quarter it includes restaurants, movie theaters, and grocery stores.  You earn the extra 5% on top on the regular cash back.  Also if you shop online thru the Discover webiste you will earn extra cash back on those purchases as well.  I pay my balance every month so I am not familiar with the interest rates.  You can use your cash back...