Squid are marine animals belonging to the class Cephalopoda, which also includes octopuses and cuttlefish. They have elongated bodies, large eyes, and eight arms, along with two longer tentacles used for capturing prey. Squid are known for their ability to swim quickly by expelling water from their bodies, making them agile predators in the ocean. These creatures are found in various ocean habitats, from shallow coastal waters to the deep sea. Squid play a crucial role in the marine food web, serving as prey for larger animals like whales, sharks, and seabirds. They are also a popular seafood choice in many cultures around the world.