Is dehydration an abnormal decrease of fluid in the body?

Dehydration is actually an abnormal decrease in the body's total water content, which can include both fluids inside the cells (intracellular fluid) and fluids outside the cells (extracellular fluid). It's important for maintaining the body's normal functions, including regulating body temperature, transporting nutrients, and removing waste. Prolonged or severe dehydration can lead to health problems and can be dangerous, especially in the case of infants, young children, and the elderly.