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　A hamburger, or simply burger, is a sandwich consisting of fillings—usually a patty of ground meat, typically beef—placed inside a sliced bun or bread roll. Hamburgers are often served with cheese, lettuce, tomato, onion, pickles, bacon, or chilis; condiments such as ketchup, mustard, mayonnaise, relish, or a "special sauce", often a variation of Thousand Island dressing; and are frequently placed on sesame seed buns. A hamburger patty topped with cheese is called a cheeseburger.

　Hamburgers are typically sold at fast-food restaurants, diners, and other restaurants. There are many international and regional variations of hamburger. Some of the largest multinational fast-food chains have a burger as one of their core products: McDonald's Big Mac and Burger King's Whopper have become global icons of American culture.　(From Wikipedia, the free encyclopedia)