Renewable energy sources are forms of energy that are naturally replenished and sustainable. Key sources include **solar energy**, harnessed from sunlight using photovoltaic panels, and **wind energy**, generated by wind turbines. **Hydropower** uses flowing water to produce electricity, while **geothermal energy** taps into the Earth’s internal heat. **Biomass energy** comes from organic materials like plant and animal waste. These sources are critical for reducing dependence on fossil fuels, lowering **greenhouse gas emissions**, and combating climate change. Renewable energy promotes environmental sustainability, enhances energy security, and creates economic opportunities through green jobs and innovation.