In these lecture notes we review some prospect for the upcoming LHC experiments in view of the exploration of the Standard Model (SM) or its minimal Supersymmetric extension (MSSM). We focus on some theoretical aspects concerning the Higgs sector of the two models. We give results for the precision observables M_W and m_t and their impact on the indirect determination of the Higgs sector. We furthermore review the prospects for the direct measurements in the SM and MSSM Higgs sector.

PACS numbers: 12.60.Fr, 12.60.Jv, 14.80.Bn, 14.80.Cp