Squaliformes is an order of cartilaginous fish that includes species commonly known as dogfish sharks and other related sharks. These sharks are characterized by their elongated bodies, pointed snouts, and small dorsal fins. They primarily inhabit deep waters and are known for their adaptability to various marine environments. Members of the Squaliformes order are typically smaller than other shark species, with many reaching lengths of only a few feet. They are important to marine ecosystems as both predators and prey, and some species, like the spiny dogfish, are commercially fished for their meat and oil.