What is the primary source of the sun's energy?

Hint: Nuclear fusion is the cause of the sun's energy. At the core, temperature and pressure are huge; hydrogen atoms unite to form helium atoms and liberate energy as gamma rays. Four hydrogen atoms combine into one helium atom and some energy. Fusion is a process that allows a group of active or fundamental stars and other more precious stars, in which tremendous energy is released.

Complete answer:
Solar energy is a renewable energy root. Every day, the sun sends out a large amount of energy. It delivers more energy each day than the world handles in one year. The sun's energy originates from inside the sun itself. Like most twinklers, the sun is made up of hydrogen and helium atoms in a plasma phase. The sun produces energy from a method called nuclear fusion. During nuclear fusion, the immense pressure and temperature in the sun's core make nuclei distinct from their electrons. Hydrogen nuclei combine and generate one helium atom. During the fusion process, radiant energy is liberated.
Only a tiny portion of the energy emitted by the sun into space strikes the Earth, one part in two billion. However, this amount of energy is tremendous. About thirty percent of the luminous energy that enters the Earth is returned into space. About half of the radiating energy is occupied by land and oceans. The environment and clouds receive the rest of the energy. In appreciation of providing a vast amount of energy directly, the sun is the reference of many different energy forms. Solar energy energies the water cycle, enabling us to provide the energy of flowing water. Solar energy forces wind formation, allowing us to utilize wind turbines to convert kinetic energy into electricity. Plants utilize solar energy for the process of photosynthesis. Even fossil fuels formerly obtained their energy from the sun.

Additional Information:
A fusion process that gives nuclei smaller than iron-56 or nickel-62 will usually release energy. These elements have a comparatively little mass per nucleon and significant binding energy per nucleon. Fusion of nuclei smaller than these releases energy, or can say an exothermic process, while the fusion of larger nuclei results in energy maintained by the product nucleons and the resulting endothermic process.

Note:
Nuclear fusion is when two or more atoms are combined to produce one or more atomic nuclei with subatomic particles. The difference in weight between the reactants and the products is observed as the release or absorption of energy. The weight difference is due to the difference in the atom's binding force between the nuclei before and after the reaction.