Rigid body motion refers to the movement of an object in which the shape and size of the object remain constant. This means that all points within the object maintain their relative positions as it moves. Rigid body motion can be described in terms of translation, where the entire object moves in the same direction, or rotation, where the object spins around a fixed axis. In physics, understanding rigid body motion is essential for analyzing the behavior of various objects, from simple tools to complex machinery. Concepts such as torque, angular momentum, and moment of inertia are crucial for studying how forces affect the motion of rigid bodies.