The coefficient of restitution measures the elasticity of collisions between two objects, indicating how much kinetic energy remains after a collision. It ranges from 0 to 1, with 0 representing a perfectly inelastic collision and 1 indicating a perfectly elastic collision. Factors influencing this coefficient include the materials involved, their surface properties, and the conditions of the collision, such as speed and angle. Understanding this concept is crucial in fields like physics and engineering, where collision dynamics are analyzed. Further detailed explanations can be found in existing literature and online resources.