Weakly coupled highT c superconductors?An overview

A short reviewof the main achievements in the development of high-T~.Josephson junction investigation is given. The six years of history of high-To superconductivity have produced in this field a variety of interesting results providing exciting perspectives and, at the same time, raising challenging questions. We shall attempt here to give a brief sketch of this topic, suitable for a nonspecialized audience, which, although oversimplified as well as incomplete, could supply some ideas about where we stand and where we are headed in this field.