How heat and light are produced in sun?

Heat and light in the Sun are produced through the process of nuclear fusion, which occurs in its core. During fusion, hydrogen nuclei combine to form helium, releasing a tremendous amount of energy in the form of heat and light. This energy then radiates outward through the layers of the Sun, eventually reaching the surface and being emitted into space as sunlight. The immense gravitational pressure and temperature in the Sun's core facilitate this fusion process.