The heat from the sun reaches to the earth through the process:

Radiation is a process through which heat transfers from the sun to the earth. If the Sun's heat falls directly on the earth, then it is called Ultra Violet Ray and that is very dangerous, it is brought to the Earth in the form of heat electromagnetic radiation by radiation process. The heat emanating from the sun is very significant because many functions on the earth are done by the heat that comes from the sun, such as the life of humans, and plants depend on sunlight.