  The concept of color transparency is introduced. This new feature of QCD is
characteristic of a gauge theory. It enables strong interactions to be studied
in a new domain: scattering amplitudes of transversally small color singlet
objects. Experimental data are still few and somehow inconclusive. Future
prospects are briefly discussed. This is a frontier problem of QCD which
deserves much attention from both theorists and experimentalists in the coming
years.
