This book takes an interdisciplinary approach to key concepts and engineering implications of tribology, bringing together the relevant knowledge needed from different fields to achieve effective analysis and control of friction and wear. This edition has been updated to include new content on the computational evaluation of cavitation effects in hydrodynamic bearings, the electrical properties of lubricants, coverage of gas and foil bearings, local directional, fractal signature methods, tribochemistry and mechanical activation, removal of oxide films, models of mechanical activation, advancing tribology with artificial intelligence, modeling, and simulation, and much more.