Iodized salt is table salt that has been fortified with iodine, an essential nutrient that helps prevent iodine deficiency. This deficiency can lead to health issues such as goiter, a swelling of the thyroid gland, and other thyroid-related problems. Iodine is crucial for the production of hormones that regulate metabolism and support overall health. 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, iodized salt is commonly used in households and food production, making it an important dietary source of iodine for many people.