Photocatalysis is a process that uses light to accelerate a chemical reaction, typically involving a catalyst. This catalyst, often made from materials like titanium dioxide, absorbs light energy, which helps to break down pollutants or convert substances into more useful forms. It is commonly used in environmental applications, such as purifying air and water. In photocatalysis, the energy from light creates reactive species that can initiate chemical transformations. This technology has potential applications in renewable energy, such as hydrogen production through water splitting, and in creating self-cleaning surfaces. Its ability to harness sunlight makes it an attractive option for sustainable solutions.