  I will briefly review the physics of top quark at high energy colliders. A
new discovery of single-top event at the Fermilab Tevatron is expected. At the
CERN Large Hadron Collider, detailed top quark properties can be measured and
new physics ideas in which top quark plays a special role can be tested. I will
also discuss a few phenomenological methods for analyzing experimental data to
study top quark interactions.
