Gastropods are a diverse group of mollusks that include snails and slugs. They are characterized by their soft bodies, which are often protected by a hard shell, although some, like slugs, lack a shell entirely. Gastropods can be found in various environments, from oceans to freshwater and even on land. They play important roles in ecosystems, helping to decompose organic matter and serving as food for other animals. These creatures move using a muscular foot, which allows them to glide smoothly over surfaces. Gastropods also have a unique feeding structure called a radula, which they use to scrape food off surfaces. Some species, such as the colorful sea slugs, are known for their striking appearances and fascinating behaviors.