The term 'Liver or Kidney' refers to two organs in the human body. The liver is a large, reddish-brown ORGAN located in the upper right side of the abdomen and is responsible for filtering toxins from the blood, producing bile, and storing energy. The kidney is a bean-shaped ORGAN located in the lower back and is responsible for filtering waste from the blood and producing urine. Both organs are essential for maintaining good health and are classified as organs and glands.