These three lectures review the state of our understanding of electroweak interactions and the search for the agent of electroweak symmetry breaking. The themes of the lectures are  (i) the electroweak theory and its experimental status,  (ii) the standard-model Higgs boson, and  (iii) aspects of electroweak theory beyond the standard SU(2)_L\otimes U(1)_Y model.

PACS numbers: 12.15.-y, 12.60.Fr, 14.80.Bn, 14.80.Cp