Zinc ion, represented as Zn²⁺, is a positively charged ion formed when zinc loses two electrons. It plays a crucial role in various biological processes, including enzyme function and protein synthesis. Zinc ions are essential for human health, contributing to immune function, wound healing, and DNA synthesis. In addition to its biological importance, zinc ions are also used in various industrial applications. They are commonly found in batteries, particularly in zinc-carbon and zinc-ion batteries, which are known for their efficiency and environmental benefits. Overall, zinc ions are vital in both living organisms and technological advancements.