Fish sauce is a condiment that is derived from fish that have been allowed to ferment. It is an essential ingredient in many curries and sauces. Fish sauce is a staple ingredient in Filipino, Vietnamese, Thai, Lao, and Cambodian cuisine and is used in other Southeast Asian countries. In addition to being added to dishes during the cooking process, fish sauce can also be used in mixed form as a dipping condiment, and it is done in many different ways by each country mentioned for fish, shrimp, pork, and chicken. In parts of southern China, it is used as an ingredient for soups and casseroles.