Sodium (Na⁺) is a chemical element and a vital mineral found in many foods. It is an essential electrolyte that helps regulate fluid balance, nerve function, and muscle contractions in the body. Sodium is commonly found in table salt, which is made up of sodium chloride (NaCl), and is important for maintaining overall health. In nature, sodium is highly reactive and is never found in its pure form. It is typically found in various compounds, such as sodium bicarbonate and sodium sulfate. Sodium plays a crucial role in various biological processes, making it important for both plants and animals.