A summary is given of Langmuir-Blodgett (LB) films, which are ultrathin organic films with controllable structures of molecular dimensions. The preparation techniques, both fundamental and advanced, are reviewed so that the characteristic features of LB films can be understood. The recent trends towards applications in electronics are also outlined, together with the historical background. It is shown that the recent “boom” in LB films represents in reality an advanced stage which has been attained after a period that is longer than the decades of fundamental studies.
