A hydrogen economy refers to a system where hydrogen is used as a primary energy carrier, replacing fossil fuels in various applications. In this economy, hydrogen can be produced from renewable sources, such as water through electrolysis, and used in fuel cells to generate electricity. This process emits only water vapor, making it a clean alternative to traditional energy sources. The transition to a hydrogen economy aims to reduce greenhouse gas emissions and dependence on oil. Key technologies include hydrogen production, storage, and distribution, as well as the development of hydrogen-powered vehicles, which can contribute to a more sustainable future.