Hydrochloric acid (HCl) is a strong, colorless, and highly corrosive organic compound that belongs to the halogen acids group. It is widely used in various industries such as food, pharmaceuticals, and cleaning products. In gastric juices, hydrochloric acid helps digest carbohydrates, proteins, and fats. It is also used in the production of various chemicals and textiles. Hydrochloric acid should be used with caution, as it can cause severe skin and eye irritation, breathing problems, and sudden heart attack or stroke.