Order Araneida, also commonly known as spiders, is a class of arthropods that belong to the phylum Arthropoda. Synonyms for Order Araneida are spider order, Araneae, and Arachnida. These creatures have two body parts, four pairs of legs, and fangs that inject venom into their prey. Spiders can be found in a variety of habitats, ranging from deserts to rainforests, living mostly in webs that they spin to catch their prey. With over 45,000 species of spiders, they play a significant role in controlling insect populations and serve as a crucial food source for other animals. Despite the fear many people may have of spiders, they are fascinating and important creatures.