A burger joint is a casual restaurant that specializes in serving burgers, which are sandwiches typically made with a ground meat patty, usually beef, placed inside a sliced bun. These establishments often offer a variety of toppings, such as lettuce, tomato, cheese, and condiments like ketchup and mustard. Many burger joints also serve sides like fries, onion rings, and milkshakes. Burger joints can vary in style, from fast-food chains to local diners. Some focus on gourmet burgers with unique ingredients, while others emphasize quick service and affordability. Popular chains include McDonald's, Burger King, and In-N-Out Burger, but many local spots also have loyal followings.