The Higgs boson is a massive scalar elementary particle predicted to exist by the Standard Model of particle physics, and discovered at CERN in 2012. Before the discovery of Higgs boson, there was no known elementary scalar bosons (spin-0 particles) in nature, although many composite spin-0 particles are known. The existence of this particle was postulated as a means of consistent incorporation of mass terms in the Lagrangian of the Standard Model. Current work consists in theoretical description of the Higgs sector and experimental research of this new particle at the LHC.