Fast food is a type of mass-produced food that is prepared and served very quickly. It began with the first fish and chip shops in Britain in the 1860s. Drive-through restaurants were first popularized in the 1950s in the United States. The food is typically less nutritionally valuable compared to other foods and dishes. While any meal with low preparation time can be considered fast food, typically the term refers to food sold in a restaurant or store with preheated or precooked ingredients, and served to the customer in a packaged form for take-out/take-away. Fast food restaurants are traditionally distinguished by their ability to serve food via a drive-through. (source)