Evaporation and boiling are two vaporization types. Evaporation involves the change of the phase of an element from liquid to gas, at temperatures lower than its boiling point, at a given pressure. Boiling involves a change of phase from liquid to gas at a temperature higher than its boiling point.
In the evaporation process, the molecules present on the surface of the liquid gain adequate kinetic energy and defeat the inter-molecular forces between them when they move in the appropriate direction. Boiling occurs when the vapor pressure of the liquid is the same as the pressure of the surrounding environment.