Again thank you to everyone on this site that has previously posted on this topic.
I am currently in Europe and when I went to an ATM on arrival it automatically came up that it was going to charge in in Dollars (DCC)). I changed that to Euros. The ATM was going to give me an exchange rate of 1.18 Euros per Dollar. I just checked my bank account and I was charged an exchange rate of 1.09 Euros per Dollar because I chose to be charged in Euros at the ATM. With what I saved I bought a pizza for lunch yesterday. I will also be in the look out for DCC on all my credit card charges.