The water cycle, also known as the hydrological cycle, is the continuous movement of water on, above, and below the surface of the Earth. It involves the evaporation of water from oceans, lakes, and other water bodies, the condensation of water vapor to form clouds, and the precipitation of water back to the Earth's surface. The expected answer should provide a comprehensive explanation of the water cycle, including the various stages such as evaporation, condensation, precipitation, and runoff. It should also emphasize the importance of the water cycle in maintaining the Earth's ecosystems, regulating climate, and providing a continuous supply of fresh water for various life forms.