A wing is a type of part used to provide lift during horizontal flight inside an atmosphere. The three-dimensional point where lift from all wings, winglets, and control surfaces average out is the Center-of-Lift. Wings are the defining feature of planes, though wings may enable short-term flying or gliding by rovers and other crafts. The lifting forces they generate can also be used in novel ways.
By themselves, wings provide no steering control, though their lifting forces will impact movement of a craft in flight. The trailing edges are often an ideal place for attaching control surfaces.