  The investigation of the dynamics responsible for electroweak symmetry
breaking is one of the prime tasks of experiments at present and future
colliders. Experiments at the Tevatron ppbar Collider and at the CERN Large
Hadron Collider (LHC) must be able to discover a Standard Model Higgs boson
over the full mass range as well as Higgs bosons in extended models. In this
review, the discovery potential for the Standard Model Higgs boson and for
Higgs bosons in the Minimal Supersymmetric extension is summarized. Emphasis is
put on those studies which have been performed recently within the experimental
collaborations using a realistic simulation of the detector performance. This
includes a discussion of the search for Higgs bosons using the vector boson
fusion mode at the LHC, a discussion on the measurement of Higgs boson
parameters as well as a detailed review of the MSSM sector for different
benchmark scenarios. The Tevatron part of the review also contains a discussion
of first physics results from data taken in the ongoing Run II.
