Eels are a type of fish that have a snakelike appearance and movement. They are elongated, slimy, and can range in size from a few inches to several feet long. They are found in both saltwater and freshwater habitats, and some species are even capable of living on land. Eels are carnivorous and feed on small fish, crustaceans, and other aquatic animals. They are an important part of the food chain and are also popular as food for humans.