  Much about the confinement and dynamical symmetry breaking in QCD might be
learned from models with supersymmetry. In particular, models based on N=2
supersymmetric theories with gauge groups SU(N), SO(N) and $USp(2 N)$ and with
various number of flavors, give deep dynamical hints about these phenomena. For
instance, the BPS non-abelian monopoles can become the dominant degrees of
freedom in the infrared due to quantum effects. Upon condensation (which can be
triggered in these class of models by perturbing them with an adjoint scalar
mass) they induce confinement with calculable pattern of dynamical symmetry
breaking. This may occur either in a weakly interacting regime or in a strongly
coupled regime (in the latter, often the low-energy degrees of freedom contain
relatively non-local monopoles and dyons simultaneously and the system is near
a nontrivial fixed-point).
  Also, the existence of sytems with BPS {\it non-abelian vortices} has been
shown recently. These results point toward the idea that the ground state of
QCD is a sort of dual superconductor of non-abelian variety.
