The world is going through a technological advancement process and as the world is getting more and more advanced in technology it is becoming more and more power hungry. To keep up with the power consumption of the current world we need more sources. Today 80% of the energy we use comes from fossil fuels. But as our sources for fossil fuels is limited we should emphasise on renewable energy. Thinking about renewable energy the first source that comes to our mind is solar energy. The Sun is the star at the centre of the Solar System. It is a sphere of hot plasma and the energy of the photons in light waves is used in solar energy. As it is a pollution free energy source developed countries are investing in modernizing the technology for making solar energy more applicable for the future. Although practical solar cells have only been available since the mid-1950s, scientific investigation of the photovoltaic effect started in 1839, when the French scientist, Henri Becquerel discovered that an electric current could be produced by shining a light onto certain chemical solutions. The effect was first observed in a solid material (in this case the metal selenium) in 1877. This material was used for many years for light meters, which only required very small amounts of power. A deeper understanding of the scientific principles, provided by Einstein in 1905 and Schottky in 1930, was required before efficient solar cells could be made. A silicon solar cell which converted 6% of sunlight falling onto it into electricity was developed by Chapin, Pearson and Fuller in 1954, and this kind of cell was used in specialized applications such as orbiting space satellites from 1958. The solar energy work in something called solar panels. Solar panels are devices that convert light into electricity. A solar panel is a collection of solar cells. It is also called PV (photo voltaic) cells. How it works is that the sun transmits energy in the form of electromagnetic radiation. When this radiation is absorbed by the solar cells, it causes rapid electron movement. In the movement, electrons are forced to move in one direction, creating direct current (DC). Then it flows into an inverter which converts the DC into alternating current (AC) producing electricity. The more light that hits a solar cell, the more electricity it is produced. We use PV methods on rooftops of houses and offices. There’s another way of using solar power which is called CSP (concentrated solar power). In this way lenses are used concentrate a large area of sunlight into a small beam and uses it as a heat source of a conventional power plant. A hybrid system of both these methods is also seen. But PV method is more advantageous for everyday use at present and thus it is more frequently seen all over the world. The economic benefits are that sunlight is free, abundant, and dependable. No CO 2 emissions are produced. Today’s commercially available silicon solar cells have efficiencies of about 18% of the sunlight falling on to them into electricity, at a fraction of the price of thirty years ago. There is now a variety of methods for the practical production of silicon solar cells. As well as solar cells made from other materials (copper indium di selenide, cadmium telluride, etc.). Solar panels are getting cheaper and more power efficient day by day. So in near future solar energy might be one of the biggest power source of the whole world.Given the low greenhouse gas emissions from solar power, increasing its adoption is an essential strategy in efforts to combat climate change at an individual and national level. This is a great way of producing energy for all of mankind. There are many reasons for this. As most scientist have discovered the world will one day run out of natural resources, which power our homes and modes of transportation and we will need a alternate form of energy when this happens. Not to mention it is 100% cleaner and safer than other forms of fossil fuels and nuclear power plants. Unless we develop new forms of energy production, our world will be in complete chaos. Sure there are other natural ways to produce energy, as stated above, but compared to the rest solar energy out performs all competitors. Solar energy is the most productive and cheapest form of green energy.