Tribology is an interdisciplinary subject that studies the interaction between sliding surfaces. It deals with three major concepts namely friction wear and lubrication. Friction refers to the resistance encountered by a body when sliding past another. It is a branch of mechanics. High friction is required for the smooth functioning of nuts and bolts paper clips and tongs. Friction is also essential for walking maintaining a grip over objects and building piles of objects. Wear can be defined as the removal of material from a solid surface as a result of the mechanical action exerted by another solid. To control the losses caused due to friction and wear a friction-reducing film is introduced between the moving surfaces that are in contact and this process is called lubrication. Thus a proper understanding of tribological processes is required to improve standards of design and increase engineering efficiency. This book provides comprehensive insights into the subject of tribology. It is a vital tool for all researching and studying this topic.