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Arachnids are a group of eight-legged invertebrate animals belonging to the class Arachnida, which includes spiders, scorpions, mites, and ticks. They are characterized by their distinctive body plan, consisting of two main body segments (the cephalothorax and the abdomen) and four pairs of legs. Many arachnids possess venom glands in their fangs or stingers, which they use to immobilize prey or defend against predators. They are diverse in their habitats, with some species found in forests, grasslands, deserts, caves, and even underwater environments. Arachnids play an important role in controlling insect populations and maintaining the balance of ecosystems.