A. Della Pia and G. Costantini publish the Scanning Tunneling Microscopy entry for the Springer Encyclopedia of Nanotechnology, Bharat Bhushan (ed). The entry starts with a discussion of the physical principles and processes at the heart of STM, followed by a description of the experimental setup and the technical requirements needed for actually operating such a microscope. The final sections are dedicated to the most frequent use and applications of STM. The publication can be found here.