What animal category does a crab belong to?

A crab belongs to the category of crustaceans. Crustaceans are a diverse group of arthropods that are characterized by their segmented bodies, exoskeletons, and jointed appendages. Crabs are one of the largest groups of crustaceans, with over 4,500 known species. They are found in all oceans and in a variety of habitats, from the intertidal zone to the deep sea. Crabs are typically scavengers, but some species are predators or filter feeders.