A Gobstopper is a type of candy known for its hard exterior and layered structure. It is designed to dissolve slowly in the mouth, revealing different flavors as you continue to suck on it. The candy is often brightly colored and can be found in various fruit flavors. Gobstoppers gained popularity from the movie Willy Wonka & the Chocolate Factory, where they were featured as a magical candy that never ends. They are typically round and can be quite large, making them a fun treat for both children and adults.