Fast food is a type of mass-produced food designed for commercial resale, with a strong priority placed on speed of service. It is a commercial term, limited to food sold in a restaurant or store with frozen, preheated or precooked ingredients and served in packaging for take-out/take-away. Fast food was created as a commercial strategy to accommodate large numbers of busy commuters, travelers, and wage workers. The fastest form of "fast food" consists of pre-cooked meals which reduce waiting periods to mere seconds. Other fast food outlets, primarily hamburger outlets such as McDonald's, use mass-produced, pre-prepared ingredients.