A hamburger, also called a burger, is a food consisting of fillings—usually a patty of ground meat, typically beef—placed inside a sliced bun or bread roll. The patties are often served with cheese, lettuce, tomato, onion, pickles, bacon or chilis with 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.

A patty or burger is a flattened, usually round, serving of ground meat or legumes, grains, vegetables, or meat alternatives. Patties are found in multiple cuisines throughout the world.