A machine refers to a physical system, which utilizes power for applying forces and regulating movement in order to complete an action. The theory of machines is an engineering science discipline that studies the relative motion of several machine parts as well as the forces acting on them. It is categorized into four branches, namely, kinetic, kinematics, statics, and dynamics. Kinematics is a branch of physics, which defines the motion of bodies along with systems of bodies without taking into account the forces responsible for moving them. It is often referred to as the geometry of motion. Dynamics as a branch of classical mechanics studies forces and their impact on motion. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory of machines. It will help the readers in keeping pace with the rapid changes in this area of study.