Catalase is an enzyme found in many living organisms, including animals, plants, and some bacteria. Its primary function is to break down hydrogen peroxide, a harmful byproduct of cellular metabolism, into water and oxygen. This reaction helps protect cells from oxidative damage. Catalase is particularly abundant in the liver and red blood cells, where it plays a crucial role in detoxifying harmful substances. The enzyme works quickly, allowing cells to efficiently manage and eliminate hydrogen peroxide, thus maintaining overall cellular health and function.