The Whopper sandwich is the signature hamburger product sold by the international fast-food restaurant chain Burger King, its subsidiary chain the BK Whopper Bar and at its Australian franchise Hungry Jacks. 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.
