Peroxidases are a group of enzymes that catalyze the breakdown of peroxides, particularly hydrogen peroxide, into water and other less harmful substances. They play a crucial role in protecting cells from oxidative damage by neutralizing reactive oxygen species. These enzymes are found in various organisms, including plants, animals, and microorganisms. In plants, peroxidases are involved in processes such as lignin synthesis and cell wall formation, contributing to growth and structural integrity. In humans, they are important for immune responses, helping to eliminate pathogens. Overall, peroxidases are essential for maintaining cellular health and supporting various biological functions.