DDE stands for Disney Dining Experience. It is a card that is available to Florida residents and annual passholders for an annual fee (IIRC, $65) that entitles the cardholder and their party (up to 10 people) a 20% discount off food and beverage (including alcohol) at most sit-down restaurants on Disney property. The discount does not apply for counter service restaurants or snack stands. I love my DDE card--it has saved me lots of $$!