Energy is the capacity to do work and is essential for all physical processes. It exists in various forms, including kinetic, potential, thermal, and chemical energy. Understanding energy is crucial for harnessing it effectively in our daily lives and for powering our technologies. Renewable energy sources, such as solar, wind, and hydropower, are becoming increasingly important as we seek sustainable alternatives to fossil fuels. These sources help reduce greenhouse gas emissions and combat climate change, making them vital for a cleaner, more sustainable future.