Squid is a type of cephalopod mollusk that belongs to the class Cephalopoda, which also includes octopuses, nautiluses, and cuttlefish. They are found in all of the world's oceans and are an important food source for many marine animals, including whales, dolphins, sharks, and seabirds.
Squid have a torpedo-shaped body with eight arms and two longer tentacles that are used for catching prey. They are highly intelligent and are capable of changing color and texture to blend in with their surroundings or communicate with other squid.
Squid are also commercially important and are caught for human consumption. They are a popular ingredient in many cuisines and are often used to make calamari and sushi. Squid ink is also used as a coloring and flavoring agent in many dishes.