Cu/Zn SOD, or copper-zinc superoxide dismutase, is an important enzyme found in many organisms, including humans. It plays a crucial role in protecting cells from oxidative stress by catalyzing the conversion of superoxide radicals into oxygen and hydrogen peroxide, which are less harmful. This enzyme contains copper and zinc ions in its structure, which are essential for its activity. Cu/Zn SOD is primarily located in the cytoplasm and is vital for maintaining cellular health by preventing damage caused by reactive oxygen species, thereby contributing to overall cellular function and longevity.