Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

The Benefits/Disadvantages of using a credit card
Everyone else seems to have focused (rightly so) on the negatives of credit cards (high interest rates) and why it is important to pay them off before interest starts accruing. Only Marin's answer briefly touched on rewards.  To me, this is the real purpose of credit cards in today's age.  Most good rewards cards can get you anywhere from 1-2% cash back on ALL purchases, and sometimes more on other categories.  Again, assuming you can pay the balance in full each month, and you are good at budgeting money, using a credit card is an easy way to basically discount 1-2% of all of the spending you put on your card.  AGAIN - this only works to your advantage if you pay off the credit card in full; using the above example of 20% interest, that's about 1.6% interest if the interest compounds monthly, which wipes out your return on rewards if you just go one month without paying off the balance.