Watch movement refers to the mechanism that powers a watch, determining how it keeps time. There are two main types: quartz and mechanical. Quartz movements use a battery and a small crystal to maintain accuracy, while mechanical movements rely on intricate gears and springs, often powered by winding or the motion of the wearer's wrist. The movement is crucial for a watch's functionality and can affect its design and maintenance. Automatic movements, a subset of mechanical, self-wind as the wearer moves, while manual movements require regular winding. Understanding watch movement helps in appreciating the craftsmanship behind timepieces.