The law of conservation of energy states that energy cannot be created or destroyed in an isolated system; it can only be transformed from one form to another or transferred from one object to another. The total energy of an isolated system remains constant over time, although it may change forms—for instance, from kinetic energy to potential energy or from thermal energy to mechanical energy.
In simpler terms, the total amount of energy in a closed system will always remain the same, even though the energy may be converted into different types or may change locations within the system. This principle is fundamental in physics and underlies many concepts in thermodynamics, mechanics, and other fields.