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“Energy” is a fundamental concept in physics that refers to the capacity to do work or produce change. It exists in various forms, including kinetic energy (energy of motion), potential energy (stored energy), thermal energy (energy related to temperature), chemical energy (energy stored in chemical bonds), and more. Energy can be transformed from one form to another but cannot be created or destroyed, according to the law of conservation of energy. It plays a crucial role in all physical processes and is essential in fields ranging from engineering to biology. In everyday life, energy is commonly associated with electricity, fuel, and heat, which are vital for powering devices, transportation, and sustaining living organisms. The measurement of energy is typically expressed in joules, calories, or kilowatt-hours, depending on the context.