Arthropoden, or arthropods, are a diverse group of invertebrate animals characterized by their segmented bodies, exoskeletons, and jointed appendages. This group includes familiar creatures such as insects, spiders, and crustaceans. They are the largest phylum in the animal kingdom, with millions of species adapted to various environments. Arthropoden have a hard outer shell made of chitin, which provides protection and support. They undergo a process called molting to grow, shedding their exoskeletons periodically. Their body structure typically consists of a head, thorax, and abdomen, allowing for specialized functions and mobility in their habitats.