The primary source of renewable energy is solar energy. Solar energy harnesses sunlight through technologies such as solar panels and solar thermal systems. It is considered renewable because it relies on an inexhaustible natural resource—the sun—which is expected to continue emitting energy for billions of years. Solar power contributes to reducing greenhouse gas emissions and reliance on fossil fuels, thereby playing a vital role in combating climate change. As technology improves and costs decrease, solar energy adoption is growing globally, making it a crucial part of the transition towards sustainable and environmentally friendly energy sources.