A chili dog is a popular American fast food dish that consists of a cooked hot dog served in a sliced bun and topped with chili, which is a spicy meat sauce. The chili is often made from ground beef, beans, tomatoes, and various spices, giving it a rich flavor. Chili dogs can be customized with additional toppings such as cheese, onions, or jalapeños to enhance their taste. They are commonly found at ballparks, food trucks, and diners, making them a favorite choice for casual dining and outdoor events.