This document discusses various processes of evaporation including evaporation, transpiration, and sublimation. It describes factors that influence evaporation such as energy supply, transport of vapor away from surfaces, and vegetated surfaces. Methods for estimating evaporation are discussed including the energy balance method, aerodynamic method, and combined method. The role of wind in enhancing evaporation and concepts of evapotranspiration from both soil and vegetation are also summarized.