Friction, lubrication, adhesion, and wear are prevalent physical phenomena in everyday life and in many key technologies. This book explains how these tribological phenomena originate from atomistic and microscale physical phenomena and shows how this understanding can be used to solve macroscale tribology problems. The book is intended to serve both as a textbook for advanced undergraduate and graduate courses in tribology and as an introduction to the field forthose scientists and engineers working with technologies where a good grasp of tribology is essential.