Iodized salt is table salt that has been fortified with iodine, a vital nutrient that helps prevent iodine deficiency. Iodine is essential for the production of thyroid hormones, which regulate metabolism and support healthy growth and development. Without enough iodine, people can develop health issues such as goiter and other thyroid-related problems. The addition of iodine to salt began in the 1920s as a public health initiative to combat widespread iodine deficiency, particularly in areas where natural iodine levels in the soil and water are low. Today, many countries promote the use of iodized salt to ensure that their populations receive adequate iodine, contributing to overall health and well-being.