The Whopper sandwich is the signature hamburger product sold by the international fast-food restaurant chain Burger King and its Australian franchise Hungry Jack's. Introduced in 1957, it has undergone several reformulations including resizing and bread changes. The burger is one of the best known products in the fast food industry; it is so well known that Burger King bills itself as the Home of the Whopper in its advertising and signage.
The company markets several variants of the burger as well as other variants that are specifically tailored to meet local taste preferences or customs of the various regions and countries in which it does business. To promote continuing interest in the product, Burger King occasionally releases limited-time variants on the Whopper.