  These lectures are intended as a pedagogical introduction to physics at
$e^+e^-$ and hadron colliders. A selection of processes is used to illustrate
the strengths and capabilities of the different machines. The discussion
includes $W$ pair production and chargino searches at $e^+e^-$ colliders,
Drell-Yan events and the top quark search at the Tevatron, and Higgs searches
at the LHC.
