A drag link converts rotary motion from a crank arm, to a second bellcrank, usually in an automotive steering system.
While the origin of the term is not clear, it pre-dates the automobile, and is described as in use in 1849 as a means of rotating a Ducie cultivator being operated by cable by stationary steam engine (or between engines).
On some applications the drag link swings from the front to the rear of the vehicle.
On these applications the drag link connects to the steering arm located at the wheel.
In some Jeep applications, the drag link will swing from right to left on the vehicle and will connect to the steering arm at the wheel.