© 2021 Elsevier LtdOur need for energy is constantly increasing. We consume existing oil, coal and natural gas resources in order to obtain energy. As fossil fuels are exhausted, their prices have increased and new energy sources have been sought. It is possible to meet the daily energy demand with renewable energy sources. The utilization rates of renewable energy resources are gradually increasing. The use of fossil fuels is reduced in order to reduce carbon emissions in accordance with international agreements. Therefore, the use of clean energy resources is encouraged. In this article, hydrogen energy, which is a clean energy source, has been examined. Subjects such as hydrogen sources, production, storage and transportation have been investigated from articles in the literature. The current uses of hydrogen energy, limitations in hydrogen use, future uses, future goals have been examined. In this article, studies on hydrogen energy have been gathered together and it is aimed to create a source for future articles.