  The problems of the standard model are briefly reviewed and the motivations
for introducing supersymmetry are discussed. Two realistic supersymmetric
models; the Minimal SuperSymmetric Model, MSSM, and its proposed extension
NMSSM are introduced briefly and then some details of the Higgs sector of NMSSM
are stated and some constraints on parameters are described. I then explore the
Higgs boson masses and couplings for some interesting scenarios, including a
few different ways of taking the limit where NMSSM reduces to MSSM.
