Barbecue (also barbeque, BBQ and barby/barbies) is both a cooking method and an apparatus. The generally accepted differences between barbecuing and grilling are cooking durations and the types of heat used.
Grilling is generally done quickly over moderate-to-high direct heat that produces little smoke, while barbecuing is done slowly over low, indirect heat and the food is flavored by the smoking process. The word barbecue when used as a noun can refer to the cooking method, the meat cooked in this way, the cooking apparatus (the “barbecue grill” or simply “barbecue”), or to an event where this style of food is featured.
Used as an adjective, “barbecued” refers to foods cooked by this method. The term is also used as a verb for the act of cooking food in this manner. Barbecuing is usually done out-of-doors by smoking the meat over wood or charcoal. Restaurant barbecue may be cooked in large brick or metal ovens designed for that purpose. There are numerous regional variations of barbecuing, and it is practiced around many areas of the world.