Solar energy is a renewable energy source. Refers to the sun’s heat radiation energy.
In modern times, it is generally used to generate electricity or provide energy for water heaters .Since the birth of life on Earth, it has mainly survived by the thermal radiation provided by the sun. Since ancient times, humans have also understood that objects can be dried in the sun and used as a method of making food, such as salt and salted fish. With the decrease of fossil fuels , solar energy has become an important part of human energy use and has been continuously developed.