The largest internal organ in mammals is the liver. It plays a crucial role in various metabolic processes, including detoxification, protein synthesis, and the production of biochemicals necessary for digestion. The liver is essential for maintaining overall health, as it helps regulate numerous functions such as blood sugar levels, cholesterol levels, and hormone production. In addition to these metabolic roles, the liver stores vitamins and minerals and helps in the digestion of fats by producing bile. Its remarkable ability to regenerate even after injury or disease underscores its importance to mammalian physiology.