Top Theory

A decade after the discovery of the top quark, we still have much to learn. As the heaviest fermion, the top quark is bound to tell us something about electroweak symmetry breaking and the origin of mass, and may even play a special role. In this talk I review the role of the top quark in the Standard Model and in new physics scenarios. I also discuss what we have to learn from top physics studies in present and future high energy experiments.