The main type of energy produced by the sun is nuclear energy, specifically through the process of nuclear fusion. In the sun's core, hydrogen atoms fuse under immense pressure and temperature to form helium, releasing an enormous amount of energy in the process. This energy radiates outward in the form of light and heat, providing warmth and power to our planet. The sun's energy drives Earth's climate and weather systems, supports photosynthesis, and is the foundation of almost all life on Earth. Solar energy harnessed by technology can also provide renewable power for human use.