Fish sauce is a condiment derived from fish that have been allowed to ferment. The term describes a wide range of products used in many different cultures for different periods of time. Fish sauce is much used in Southeast Asian and southern Chinese cooking to add saltiness to dishes. In Southeast Asian cuisines, it is also used as a dipping condiment for fish, shrimp, pork, and chicken. However in southern China, it is only used as a cooking oil or cooking ingredient for soups and casseroles.