The family Clubionidae, commonly known as sac spiders, belongs to the order Araneae. These spiders are generally small to medium-sized and are characterized by their pale coloration, elongated bodies, and habit of constructing silk sacs or retreats where they rest during the day. Clubionids are primarily nocturnal hunters, actively foraging for insects rather than using webs to capture prey. They are found worldwide in a variety of habitats, including leaf litter, under bark, and inside human structures. Though most are harmless to humans, some species can deliver mild bites, and they play an important role in controlling insect populations in their ecosystems.