The source of mass is a long-time problem. The Einstein’s special relativity reveals that mass and energy can transfer to each other and this truth has been proved by many things such as the nuclear power. In the electroweak theory, the Higgs mechanism makes the gauge bosons obtain their mass. If the vacuum states of the Higgs fields are the sources of mass for the massive gauge bosons

Keywords : The Electroweak Theory, Higgs Mechanism, Gauge Boson, Fermion, Mass, Yukawa Coupling