Linked from
The 9 pages that link to Enthalpy of vaporization, each with the reason it gives.
EnthalpyBroader topic: It describes the energy absorbed during a constant-pressure phase change.
VolatilityRelated: It quantifies the energy needed for molecules to leave the liquid phase.
Latent heatBroader topic: It measures the latent heat needed to overcome liquid-phase cohesion.
VaporizationRelated: It quantifies vaporization energy on a molar or mass basis.