The energy from the Sun travels to the earth in the form of electromagnetic waves that are distributed all over the earth's surface. This is called solar energy as it comes from the Sun, which is the primary source of all energy. Solar power energy is converted into various other forms to produce heat, light and electricity. Abundant of solar energy travel to the earth out of which only a small fraction is used by the earth. Moreover, solar power is renewable which makes its use continuous and cost-free. It is very important to understand how solar energy works for our benefit.