The Big Mac became McDonald’s signature burger after its national launch in 1968.
Jim Delligatti, a McDonald’s franchisee in the Pittsburgh area, developed the sandwich before it was introduced nationwide. Its defining structure included two beef patties, a middle bun layer, lettuce, cheese, pickles, onions, and special sauce.
The Big Mac’s name and distinctive layered appearance made it especially valuable as a branding symbol. It became more than one menu item: the sandwich appeared in advertising, international promotions, and comparisons of purchasing power.
The Big Mac should not be confused with the Quarter Pounder, another major McDonald’s burger. The Quarter Pounder is identified by its quarter-pound beef patty, while the Big Mac is identified by its two-patty, three-bun format.