The science of interacting surfaces in relative motion is referred to as tribology. The field of tribology consists of lubrication, friction and wear of contact elements relevant to practical operations. Latest results and advancements are discussed and analyzed in the context of established information. The book combines fundamental concepts with novel findings. It discusses topics such as lubrication, the characteristics of lubricants, boundary lubrication applications, testing and modeling, and sustainability of tribosystems. The book includes contributions by prominent experts and attempts to convey latest research trends in tribology to students, scientists and practitioners.