Big Mac was the McDonald's product name trademarked in 1968 and became a major branding icon.
McDonald's introduced the Big Mac nationally in the United States in 1968. The sandwich had two beef patties, a special sauce, lettuce, cheese, pickles, onions, and a three-part sesame-seed bun. Its distinctive construction and memorable name made it more than another menu item: it became a central part of McDonald's product branding.
The sandwich had been developed earlier by franchisee Jim Delligatti, who operated McDonald's restaurants in the Pittsburgh area. The national launch followed regional testing and helped establish a premium, signature item within a menu otherwise known for standardized everyday products.
The Big Mac is sometimes confused with the Quarter Pounder because both became flagship McDonald's sandwiches. They differ in construction and branding history: the Big Mac is defined by its two patties, middle bun layer, and special sauce, while the Quarter Pounder emphasizes the stated weight of its beef patty before cooking.