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Arachnids are eight-legged invertebrate animals belonging to the class Arachnida, which also includes spiders, scorpions, mites, and ticks. They have two main body segments, the cephalothorax (fused head and thorax) and the abdomen, with no antennae or wings. Many arachnids possess venom glands used for hunting or self-defense, making them a fascinating yet sometimes intimidating part of the animal kingdom. Their diversity in habitats ranges from terrestrial to aquatic environments, showcasing their adaptability and resilience as creatures that have been around for over 400 million years.