The Big Mac became a major part of McDonald's branding after its national introduction in 1968.
The sandwich was created by Jim Delligatti, a McDonald's franchisee who operated restaurants in the Pittsburgh area. It used two beef patties, a special sauce, lettuce, cheese, pickles, and onions on a three-part sesame-seed bun.
McDonald's introduced the Big Mac nationally in 1968, turning a regional franchise innovation into one of the company's signature products. Its distinctive name and stacked appearance made it especially useful in advertising and visual branding.
The Big Mac should not be confused with the Quarter Pounder, which is identified by its beef-patty weight, or the Egg McMuffin, a breakfast product. The Big Mac's importance lies in its role as an enduring flagship menu brand.