Evaporation is the physical process by which a liquid transitions into a gaseous state, or vapor, at a temperature below its boiling point. This phase change occurs because individual molecules on the surface of the liquid acquire sufficient kinetic energy to overcome the intermolecular forces holding them together, allowing them to escape into the surrounding atmosphere. The rate of evaporation is highly dependent on external factors, including temperature, the relative humidity of the air, and the surface area exposed. This process is fundamental to various natural systems, such as the hydrological cycle, and is a critical concept in thermodynamics and material science.