In Charlie and the Chocolate Factory as well as the movie adaptation, Willy Wonka and the Chocolate Factory, Our protagonist, Charlie, is tempted by Slugworth (A metaphor for Satan), to steal an Everlasting Gobstopper. Slugworth tempts him by offering him more money that he ever imagined, money which could veritably solve all of his and his family's problems. After being going through the chocolate factory, and being tested many times by Wonka, Charlie still does the right thing and returns the gobstopper to Willy Wonka. Knowing now that Charlie truly is pure of heart and innocent, Wonka gives the entire chocolate factory to Charlie.
In the movie, the Everlasting Gobstopper is introduced coming through an assortment of maniacal pulleys, valves, compressors, cookers, and conveyor belts, reminiscent of Dr. Seuss and Rube Goldberg. The Everlasting Gobstopper is a hard candy, designed not to be eaten, but to be sucked on. As it is sucked on, it released sugar as well as changes color. Previous gobstoppers like these had been around for a while, but not an everlasting gobstopper. For the candy industry, this was a breakthrough. And that is why Slugworth wanted to get his hands on it so badly.
In reality, Willy Wonka products, a subdivision of Nestle, makes candy similar in design to that in the movie. They make Everlasting Gobstoppers, which, although Gobstoppers, are not everlasting. They also make Wonka Bars, Oompa-Loompas, and other fine candies. Sadly, there is no real-life Willy Wonka, however many writers have based their lives trying to emulate him.