Mollusks, also known as molluscs, are a diverse group of animals that belong to the phylum Mollusca. They have soft bodies and no backbones, and they can be found in various habitats such as oceans, freshwater rivers, lakes, and on land. Some common examples include snails, clams, squid, octopus, and slugs. These animals are known for their unique features like a hard external shell (except for some species), the ability to regenerate lost body parts, and the use of various methods for reproduction such as spawning or laying eggs. Mollusks play important roles in ecosystems as both predators and prey, and they are also used by humans for food, medicine, and other purposes.