The Big Mac is a signature hamburger sold by McDonald's, known for its unique flavor and distinctive structure. It features two beef patties, special sauce, lettuce, cheese, pickles, and onions, all sandwiched between a three-part sesame seed bun. This combination has made it a favorite among fast food enthusiasts worldwide. Introduced in 1967, the Big Mac has become a cultural icon, often associated with the fast food industry. Its popularity has led to various marketing campaigns and even a dedicated fan base, making it a staple menu item that represents the essence of American fast food culture.