  This review is based on lectures on technicolor and extended technicolor
presented at the Frascati Spring School in May 2000. I summarize the motivation
and structure of this theory of dynamical breaking of electroweak and flavor
symmetries. Particular attention is paid to the main phenomenological obstacles
to this picture-flavor-changing neutral currents, precision electroweak
measurements, and the large top-quark mass-and their proposed
resolutions-walking technicolor and topcolor-assisted technicolor. I then
discuss the signatures for technicolor and the existing and upcoming searches
for them at LEP, the Tevatron Collider, and the Large Hadron Collider. The
final section lists some outstanding theoretical questions.
