Smart City and Smart Building projects have been embracing sustainability as a key factor to gauge their success. Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt power plants and artificial photosynthesis. This eBook gives the reader a quick overview of Solar Energy. A must read for Smart City and Building enthusiasts.