Urine is a liquid waste product produced by the kidneys in the human body. It is primarily made up of water, but it also contains various substances like urea, salts, and toxins that the body needs to eliminate. The kidneys filter the blood, removing these waste materials, which are then stored in the bladder until they are expelled through the urethra. The color and smell of urine can vary based on factors like hydration, diet, and health. For example, drinking plenty of water usually results in clear urine, while dehydration can lead to darker urine. Certain foods, like beets, can also change the color of urine, while some medications may affect its odor.