This publication provides an overview of a rapidly growing field of molecular electronics. It comprises an introduction to theoretical concepts, experimental approaches and techniques. The use of spontaneous self-assembly is to overcome the obstacles associated with miniaturisation threshold of conventional material technologies. The attractiveness of self-assembly arises from the ease of fabrication of energetically stable, well-ordered films that mimic macroscopic material´s properties at the molecular level.Joanna Gigon received her PhD in Chemistry in July 2010. Her research activity focuses on the molecular self-assembly on metal surfaces.