The Law of Conservation of Energy states that energy cannot be created or destroyed; it can only change forms. This means that the total amount of energy in a closed system remains constant over time. For example, when you turn on a light bulb, electrical energy is converted into light and heat energy. In practical terms, this law applies to many processes in nature and technology. When a car moves, the chemical energy in fuel is transformed into kinetic energy, allowing the car to travel. Understanding this law helps scientists and engineers design efficient systems and predict how energy will flow in different scenarios.