Solar Energy in term of Photovoltaic (PV) solar cells as one of the promising renewable energy sources which has the potential to meet the future energy demand. The importance of developing different types of renewable energy sources which include solar, wind, hydro, biomass, geothermal and hydrogen gas to supply the energy for sustainable development will present. The different types and the principle of the PV cells fully discussed. The potential applications and futures prospect of the PV solar energy system in the various area of life will be considered and discussed.