This is a wok. Its main purpose is to stir-fry foods, i.e. quickly cooking foods and using butter or oil. Some foods which are often stir-fried include meat, vegetables, rice, fish and pasta.
This is a pressure cooker. It is designed to cook foods by trapping hot air and steam under the lid. Traditionally, pressure cookers cook foods which need steaming or the evaporation of water, such as rice, well.