Spiders are arachnids, which means they have eight legs and belong to the class Arachnida. Their bodies are divided into two main parts: the cephalothorax and the abdomen. The cephalothorax contains the eyes, mouthparts, and legs, while the abdomen houses the digestive and reproductive organs. Spiders also have specialized structures called spinnerets that produce silk for web-making, hunting, and protection. They possess fangs that can inject venom into their prey, aiding in digestion. Additionally, most spiders have multiple pairs of eyes, which help them detect movement and navigate their environment effectively.