Thermal energy is the energy that is generated or released due to the increase or decrease in temperature in a system. It is a significant form of energy that is widely used in various fields. Synonyms for thermal energy include heat energy, thermal power, thermal motion, and thermal radiation. Heat energy is a form of thermal energy that is transferred from one body to another due to temperature differences. Thermal power refers to the energy that is generated by converting thermal energy into electrical energy. Thermal motion refers to the random motion of particles in a substance due to its temperature. Thermal radiation is the energy emitted by an object as electromagnetic waves due to its temperature.