Photocatalysis is a process in which a catalyst is activated by light to accelerate a chemical reaction. This technology harnesses the power of sunlight or artificial light sources to induce chemical reactions that would not occur under normal conditions. Photocatalysis is often used in environmental remediation, energy production, and the synthesis of organic compounds. One common application of photocatalysis is in the degradation of pollutants in water and air, as the catalyst can break down harmful substances into less toxic compounds.