Fast food refers to food that is prepared and served quickly, often in a restaurant or through a drive-thru. It typically includes items like burgers, fries, pizza, and fried chicken. Fast food chains, such as McDonald's and Burger King, are popular for their convenience and affordability, making them a common choice for busy individuals and families. The fast food industry has grown significantly since the mid-20th century, with many locations worldwide. While fast food is known for its speed and low cost, it is often criticized for being high in calories, fats, and sugars, which can contribute to health issues when consumed frequently.