Phenomenology of Supersymmetric Theories with and without R-Parity

We review supersymmetry models with and without R-parity. After briefly describing the Minimal Supersymetric Standard Model and its particle content we move to models where R–parity is broken, either spontaneously or explicitly. In this last case we consider the situation where R–parity is broken via bilinear terms in the superpotential. The radiative breaking of these models is described in the context of b–τ and b–τ–t unification. Finally we review the phenomenology of these R-parity violating models.