Solar energy conversion and its application methods varies in wide range from passive solar to heat building to complex concentrated form to generate electricity. It is crucial to know these structures in detail and to classify them in methodical order. The constituent mechanism of primary energy sources have been briefly mentioned. Hereafter the classification of renewable energies, various application methods of solar power, the amount of solar energy falling on the earth, the main effects created by solar energy, and energy conversion methods, inclusively concentrated solar power, have been discussed.