Energie, or energy, is the ability to do work or cause change. It exists in various forms, including kinetic energy, potential energy, thermal energy, and chemical energy. Energy can be transformed from one form to another, but it cannot be created or destroyed, a principle known as the law of conservation of energy. In everyday life, energy powers our homes, vehicles, and devices. It is generated from sources like fossil fuels, solar power, and wind energy. Understanding energy is crucial for addressing issues like climate change and developing sustainable practices to ensure a reliable energy supply for the future.