2. Barbecue is probably the most primitive way of cooking. It uses fuel to heat dry air, and puts food in dry and hot air near the heat source to heat food. Generally speaking, barbecue is to cook meat, seafood, vegetables and other foods until they are edible. In modern society, because there are many ways to use fire, the barbecue methods are gradually diversified, and various barbecue ovens, grills, barbecue sauce and so on have been developed.