The textbook presents a brief outline of solar energy applications that includes introduction to photovoltaic cells, environmental impacts of photovoltaic technologies, photovoltaic system economics, manufacturing of photovoltaics cells, applications of photovoltaic systems, advantages and limitations of photovoltaic cells, and conclusion. The aim of the present textbook was to review the importance of studying solar energy applications that includes introduction to photovoltaic cells, environmental impacts of photovoltaic technologies, photovoltaic system economics, manufacturing of photovoltaics cells, applications of photovoltaic systems, advantages and limitations of photovoltaic cells, and conclusion.