Hydrogen storage refers to methods used to safely store hydrogen gas for later use. Hydrogen can be stored in various forms, including compressed gas, liquid hydrogen, or in solid materials. Each method has its advantages and challenges, such as energy density, safety, and cost. Effective hydrogen storage is crucial for applications like fuel cells and renewable energy systems. It allows for the efficient use of hydrogen as a clean energy source, supporting technologies like hydrogen fuel cells in vehicles and renewable energy systems that rely on solar or wind power.