An arthropod is a member of the phylum Arthropoda, which includes invertebrates such as insects, arachnids (Spiders and scorpions), crustaceans (crabs and lobsters), and myriapods (centipedes and millipedes). Arthropods are characterized by their exoskeleton, segmented bodies, and jointed appendages. They are the most diverse and abundant group of animals on Earth, playing crucial roles in ecosystems as pollinators, decomposers, and as part of the food web.