  A representative but not exhaustive review of the Schwinger-Dyson equation
(SDE) approach to the nonperturbative study of QCD is presented. The main focus
is the SDE for the quark self energy but studies of the gluon propagator and
quark-gluon vertex are also discussed insofar as they are important to the
quark SDE. The scope of this article is the application of these equations to
the study of dynamical chiral symmetry breaking, quark confinement and the
phenomenology of the spectrum and dynamics of QCD.
