White Castle, founded in 1921, holds the distinction of being credited with the establishment of the first "fast food" chain. Its founder, Billy Ingram, pioneered the concept of a streamlined production system that enabled quick service and standardized food quality. The company introduced the world to the iconic square-shaped sliders, which were small, affordable, and served efficiently to customers. This innovative approach revolutionized the restaurant industry by introducing the principles of fast food, including rapid service, efficient operations, and consistent menu items. White Castle's success laid the foundation for the subsequent growth of the fast food industry, influencing other notable chains that emerged later, such as McDonald's. Today, White Castle continues to be recognized as a pioneer and a symbol of the early origins of fast food culture in the United States.