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Arachnids are a group of eight-legged invertebrate animals belonging to the class Arachnida, which also includes spiders, scorpions, mites, and ticks. They are characterized by their segmented body with two main parts, the cephalothorax (fused head and thorax) and the abdomen, as well as their lack of antennae and wings. Arachnids have simple eyes, usually two to four pairs, and are equipped with specialized appendages for feeding, mating, and defense. Many arachnids produce silk, which they use for various purposes such as capturing prey, building shelters, or reproduction. They are found worldwide in diverse habitats ranging from terrestrial to aquatic environments, and play important ecological roles as predators, scavengers, and parasites.