Grilling is a cooking method that involves cooking food directly over an open flame or heat source. It is typically done outdoors on a grill or barbecue. Grilling gives food a smoky and charred flavor, and it is commonly used for cooking meat, vegetables, and seafood. Boiling involves cooking food in a liquid at a high temperature, frying involves cooking food in hot oil, and steaming involves cooking food with steam. However, none of these methods involve cooking food directly over an open flame or heat source like grilling does.