Family Anguillidae is commonly known as the eel family, and its members are found in freshwater and marine environments worldwide. There are several synonyms for this family, including Anguilliformes, Anguilloidei, and Anguilliforms. The family comprises 19 species, including the American eel, European eel, and Japanese eel, among others. The eels are elongated and snake-like in appearance, and their diet consists of various small aquatic animals. They are a popular food source in many cultures, and their importance in the marine ecosystem cannot be overstated. Their unique life cycle has fascinated scientists for centuries, and they continue to be a subject of ongoing research.