The center of mass is a point in an object or system where its mass is evenly distributed. It represents the average position of all the mass in the object. For symmetrical shapes, like a sphere or a cube, the center of mass is located at the geometric center. In more complex shapes, it can be found using mathematical calculations based on the distribution of mass. In a system of multiple objects, the center of mass can be determined by considering the masses and positions of all the objects involved. For example, in a two-body system like a planet and its moon, the center of mass is the point around which both bodies orbit, often located closer to the more massive object.