Fluid balance refers to the equilibrium between the intake and output of fluids in the body. It is crucial for maintaining proper physiological functions, as water is essential for processes such as digestion, circulation, and temperature regulation. An imbalance can lead to dehydration or overhydration, both of which can have serious health consequences. Maintaining fluid balance involves monitoring factors like diet, exercise, and climate. The body uses mechanisms such as thirst and urine production to regulate fluid levels. Understanding fluid balance is vital for athletes, individuals with certain medical conditions, and anyone looking to optimize their health.