The chemical formula for potassium chloride is KCl. This compound consists of one potassium (K) ion and one chloride (Cl) ion, forming a simple ionic bond. Potassium chloride is an important chemical used in various applications, including as a dietary supplement for potassium deficiency, in fertilizers for agriculture, and in medical settings for electrolyte balance. It is also commonly used as a salt substitute in cooking for those on sodium-restricted diets, due to its similar taste without the high sodium content.