A stir-fry skillet, also known as a wok, is a round-bottomed cooking vessel originating from China. It is used for stir-frying, deep-frying, steaming, and braising. The wok is designed to distribute heat evenly and quickly, allowing food to be cooked at high temperatures with minimal oil. It is an essential tool in Chinese cuisine, and is becoming increasingly popular in other cuisines around the world.