Renewable energy means energy from renewable sources, such as; solar, wind, geothermal, tidal, wave and other ocean energy, hydropower, biomassand biogas, etc. These resources are called renewable as they are naturally replenished in a short period of time. Solar and geothermal energy can be used both for electricity production and for heating and cooling. Some other renewables, such as wind, tidal, wave and hydropower are usually used for producing mechanical motion or electricity. Biomass can be considered as the most diverse RE source, as it can be used in almost all the sectors; electricity, heating and cooling, and transportation (in form of biofuels). This chapter discusses various types of renewables, their benefits and the need for renewable energy production.