It was in 1970s when physicists deduced a series of theorems from the theory of General Relativity about black hole event horizons. These theorems exhibited an astonishing analogy with the four laws of thermodynamics; however, at the time being, physicists thought that black holes were perfect absorbers and did not emit anything. Thus, they did not deem such similarities more than a mere coincidence. In this project, we consider the effect of quantum field theory in the curved spacetime presenting the formation of a Schwarzschild black hole by collapsing of a null shell. Then, we review the concepts and calculations which show a Schwarzschild black hole is not as black as its name implied and as a result we connect those proven theorems to thermodynamics. Furthermore, we conclude that quantum mechanics predicts black holes, like other systems in statistical mechanics, have thermodynamics behavior. Moreover, we study some questions, such as information loss paradox, arisen from black hole evaporation.