A trace element is a chemical element that is present in minute amounts in a given environment, such as soil, water, or living organisms. These elements are essential for various biological processes, even though they are required in very small quantities. Common trace elements include iron, zinc, and copper, which play crucial roles in functions like enzyme activity and immune response. Despite their small concentrations, trace elements can significantly impact health and development. Deficiencies or excesses of these elements can lead to various health issues. For example, a lack of iodine can cause thyroid problems, while too much selenium can be toxic.