The book "Ultrathin Electrochemical Chemo- and Biosensors" offers a comprehensive analysis of alternative chemical and biological sensors that go beyond traditional enzymatic sensors. This specialized book, part of the new Springer series on chemical and biosensor technologies, places particular emphasis on the principles of impedance spectroscopy, both linear and non-linear. The authors, leading experts in their field, illuminate the advancements in the technology of self-assembled monolayers, which play a key role in the immobilization of organic molecules on electrodes. These developments have led to innovative analytical applications of impedimetric sensor methods. The book is aimed at professionals and students interested in the latest advancements in sensing technology and its practical applications.