A "wing" is a specialized structure that allows animals, particularly birds and insects, to fly. Wings are typically made of feathers or membranes and are attached to the body, providing lift and propulsion. The shape and size of wings can vary greatly among species, influencing their flying abilities and behaviors. In addition to animals, the term "wing" can also refer to architectural features, such as the side sections of a building. For example, a hospital may have a pediatric wing dedicated to children's care. In aviation, a wing is a crucial part of an aircraft, designed to generate lift during flight.