Psocoptera is an order of small insects commonly known as booklice or barklice. They are typically found in damp environments and feed on mold, fungi, and organic debris. These insects have soft bodies and can range in size from 1 to 10 millimeters. Booklice are often mistaken for lice due to their name, but they are not parasitic. They have wings in some species, while others are wingless. Psocoptera play a crucial role in the ecosystem by helping to decompose organic matter and recycle nutrients in the environment.