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 simple shapes, like a uniform rod or a sphere, the center of mass is located at their geometric center. In more complex shapes, it can be found using mathematical calculations or physical experiments. 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 system with two objects, the center of mass will be closer to the heavier object. Understanding the center of mass is essential in fields like physics and engineering, as it affects how objects move and balance, such as in the case of a bicycle or a rocket.