The bending moment is used to bend sheet metal. The bending moment can best be described as a certain force couple exerted on the material. The force torque ensures pressure and strain stress.
Sides and moves are two names for the same work. It is permanent distortion. Because the metal is permanently deformed, fewer metal parts are needed in a structure, for example. After all, a one-piece component also requires less assembly. Edging or setting therefore also saves costs.