Booklice are small, wingless insects belonging to the order Psocoptera. They typically measure about 1 to 2 millimeters in length and are often found in damp environments, such as basements or libraries. Their diet mainly consists of mold, mildew, and organic materials, which is why they are commonly seen in places with high humidity. These pests are not harmful to humans or pets, but they can damage books and paper products by feeding on the glue and organic matter. To control a booklice infestation, it is essential to reduce humidity levels and maintain proper ventilation in affected areas.