The process by which water turns into vapor is called evaporation. Evaporation occurs when water molecules at the surface gain enough energy, often from heat, to transition from a liquid state to a gaseous state. This process can occur at any temperature, though higher temperatures lead to faster evaporation rates. It plays a crucial role in the water cycle, allowing water from oceans, lakes, and rivers to enter the atmosphere. Evaporation is essential for weather patterns and climate regulation, as it contributes to humidity levels and precipitation. It is also an important factor in various natural and industrial processes.