Credit or a deduction.
if you paid foreign taxes, you have the option of either taking a credit or a deduction to help cover you from double taxation.
if you take the credit you need to file an additional form with your tax return in order to receive the credit. if you want the deduction, you will then need to itemize in order to receive the deduction.
both the credit and deduction help you lower your taxes. but depending on your situation one might help more than the other.
make sure your tax advisor, knows the difference to help get you the most refund.