Flywheel energy storage is a technology that stores kinetic energy in a rotating mass. There are many synonyms for the term, including gyroscopic energy storage, mechanical battery, rotational kinetic energy storage, and kinetic energy flywheel. Other terms that are sometimes used to describe this technology include inertia energy storage, kinetic storage devices, and mechanical energy storage. Regardless of the specific term used, flywheel energy storage is a powerful and effective way to store and release energy over time, making it an important technology for a variety of applications, from renewable energy to transportation. As the demand for sustainable energy solutions continues to grow, flywheel energy storage is likely to play an increasingly important role in meeting that demand.