Color Transparency Physics: a New Domain of Strong Interactions

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. The current lively debate on the nature of the Pomeron reflects our poor understanding of long distance strong interaction physics. Color transparency experiments offer us in this respect a unique opportunity to challenge various theoretical models through their description of the strong interactions of color singlet small objects.