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Fast food, also known as fast food, is a general term for food that can be prepared and served quickly. Generally speaking, food can be taken by hand, and most of it can be taken out or taken out without tableware. Since the beginning of the 20th century, fast food has become more and more popular because of its low cost and short production time. American fast food is the mainstream of modern fast food, but Chinese fast food and Japanese fast food have also developed to a certain extent. Contrary to western understanding, fast food in China and Japan usually needs chopsticks to eat. Fast food has the advantages of popularity and convenience, and now it has become a common way of life, which has led to the emergence of "fast food culture" and "fast food doctrine"