A buck, a franc, a yen, or a pound. . .
Money makes the world go around!
At least you need to know a little about what money is worth if you are going to do any travelling. You need to know the "current exchange rate" so that you get your money's worth when you make make currency swaps.
Below are some links to help you get accurate and up-to-date information on what your money is actually worth in different parts of the world.