FastPass+ is a system used at Walt Disney World that allows guests to reserve access to certain attractions, entertainment, and character meet-and-greets in advance. This helps reduce wait times and enhances the overall experience by allowing visitors to plan their day more efficiently. Guests can select up to three FastPass+ experiences per day in a specific park, and they can modify or add more once those initial selections are used. The service is available through the My Disney Experience app or website, making it easy for guests to manage their reservations on the go.