Automatic watches have a rotor attached to the movement so that when you move your wrist, the rotor spins and winds the watch back up again by tightening the mainspring
On the other hand a Mechanical Watch need to be wound by hand. That is why the mechanical watches are also called hand wound watches.
The first wristwatch was made for Countess Koscowicz of Hungary by the Swiss watch manufacturer Patek Philippe in 1868, according to Guinness World Records.