Disney Dollars were introduced by the Walt Disney Company in 1987. They are legal tender at all Disney theme parks and resorts, and at all Disney Stores. Their value is tied directly to that of the United States dollar, at a fixed exchange rate of 1.0000.
When the currency was introduced, only two denominations were printed: the one-Disney Dollar bill and the five-Disney Dollar bill. The one featured Mickey Mouse's portrait on the front; the five had Goofy's. Later, a ten-Disney Dollar bill was created, with Minnie Mouse on the front. That bill thus became the first paper currency in the United States to feature the portrait of a female.
Periodically, new series of Disney Dollar bills are issued, and unlike other US currency, the images on the bills have changed frequently.
The bills are printed in full-color, with scenes from the Disney parks appearing on the backs. They are signed by Scrooge McDuck as the Disney treasurer. Despite the fact that there are few, if any, anti-copying measures incorporated into the currency, counterfeiting appears to extremely rare (if not non-existent).
Although it's not necessary, it's highly advisable to exchange a large amount of the cash you'll be bringing into Disney Dollars before visiting a park. This will maximize the fun. Unfortunately, most Disney vendors return change in standard US currency.
Many people actually keep their Disney Dollars as souvenirs of their visits to the Disney parks, even though they could be used to pay for valuable Disney merchandise.