This book has been written to meet the course on tribology-friction, wear, lubrication and bearing of Mechanical, Civil, Automobile and Aeronautical Engineering Curriculum for the undergraduate and postgraduate students. The book is especially useful for the researchers, practicing engineers and professionals for their general requirements. The book provides a simple, clear and exhaustive treatment of friction, lubrication, bearing and wear data. The text in this volume covers the topics such as introduction, meaning, and disciplines of tribology; wear and its types; theories, causes, uses, and measurement methods of friction; properties, functions, advantages, and types of lubricants; design, journal, and materials of bearings; and surface topography and its techniques