Current drive is a fundamental research concept and technological approach within magnetic confinement fusion science, focused on the generation and sustainment of toroidal electric current in a plasma without relying on inductive coupling. This field investigates various methods, such as injecting electromagnetic waves or particle beams, to impart momentum to plasma electrons or ions, thereby creating and maintaining the necessary current profile required for plasma stability and confinement in devices like tokamaks and stellarators, which is crucial for achieving steady-state fusion reactor operation.