A concise review is given of the current status of the metal‐insulator transition problem, and of the related problem of destruction of superconductivity by disorder. For the metal‐insulator transition it is argued that recent experimental and theoretical advances allow for a consistent description and understanding of most aspects of the problem. In particular, a recent proposal for a solution of the so‐called exponent puzzle is discussed. For disordered superconductors, the salient points of a recent mean‐field theory for the suppression of superconductivity are explained.