A cooker is a kitchen appliance used for preparing food by applying heat in a controlled manner. It is commonly used in homes, restaurants, and food service areas. Cookers come in different types such as electric cookers, gas cookers, pressure cookers, and rice cookers. The main components depend on the type but generally include a heating source (electric coil or gas burner), cooking pot or chamber, temperature or pressure control system, lid, and safety valves (especially in pressure cookers).

In operation, the cooker generates heat through electricity or gas, which is transferred to the cooking pot or chamber. Food and water are placed inside, and heat is applied to cook the contents by boiling, steaming, frying, or pressure cooking. In a pressure cooker, steam builds up inside the sealed pot, increasing pressure and temperature, which cooks food faster. Safety valves regulate excess pressure to ensure safe operation. Electric and automatic cookers use thermostats to control temperature and prevent overheating. Cookers are valued for their simplicity, efficiency, and ability to prepare food quickly and evenly.