N-doped mesoporous carbon spheres are widely utilized in energy storage applications, particularly in supercapacitors and lithium-ion batteries, due to their high surface area and excellent electrical conductivity. The nitrogen doping enhances their electrochemical performance by improving charge transfer and providing additional active sites. In catalysis, these materials serve as efficient supports for metal nanoparticles, facilitating reactions such as oxygen reduction in fuel cells. They are also employed in environmental applications, including the adsorption of pollutants and heavy metals from water, thanks to their porous structure and surface functionality. Additionally, their unique properties make them suitable for gas storage and separation processes.