The primary ingredient in macaroni and cheese is macaroni, which is a type of pasta. Traditionally, macaroni is made from durum wheat flour and water, shaped into the familiar elbow or tubular form. The dish combines cooked macaroni with a creamy cheese sauce, which can be made from various cheese types, most commonly cheddar. The combination of the soft pasta and the rich, melted cheese creates a comforting and flavorful meal that is beloved by many. Macaroni and cheese can be served as a side dish or as a main course and can often be customized with additional ingredients like breadcrumbs or vegetables.