With an automatic movement, the watch must be wound by an oscillating weight. This is set in motion by sufficient movement of the watch when worn on the wrist. Therefore, it’s also possible that if a watch with an automatic movement is not worn for too long, the watch will stop.
Whether your watch is equipped with an automatic movement is indicated by a note on the case of the watch (on the dial or back).
A hand-wound movement (manual movement) must be wound daily by hand, clockwise via the crown until resistance is felt.