The Sun gives this planet all natural heat and light. Plants require the Sun for the natural process of photosynthesis to take place. In photosynthesis, carbon is absorbed and oxygen is released. The solar wind causes the polar auroras.
Solar flares can disrupt radio communications and damage satellites.
Ultraviolet radiation from the Sun can penetrate the Earth's atmosphere. Solar power turns the energy generated by the Sun into electricity for us. Space craft such as satellites use solar panels to power their internal devices.