  Discovering the dynamics responsible for electroweak symmetry breaking is the
outstanding question facing particle physics today, and the answer will be
found in the next decade. In these lectures I discuss the range of models which
have been proposed to explain electroweak symmetry breaking. I begin with an
overview of Higgs models, with emphasis on the naturalness/hierarchy and
triviality problems, and then consider general lessons which can be drawn about
the symmetry breaking sector in arbitrary scalar models. Subsequently, I
discuss the symmetry breaking sector in supersymmetric models and then consider
models of dynamical electroweak symmetry breaking. I conclude with a brief
review of the open questions.
