It seems like there might be a typo in your question. If you meant "arthropod," arthropods are a diverse group of invertebrate animals that includes insects, arachnids, crustaceans, and myriapods. They are characterized by their segmented bodies, exoskeletons made of chitin, and jointed appendages. Arthropods are the largest phylum in the animal kingdom, playing crucial roles in ecosystems as pollinators, decomposers, and as part of food webs.