Hydration plays a crucial role in overall health by regulating body temperature, maintaining cellular function, and supporting metabolic processes. Adequate hydration aids digestion and nutrient absorption while also helping to flush out toxins. Dehydration can lead to fatigue, decreased cognitive function, and impaired physical performance. For optimal health, individuals should consume enough fluids daily, considering factors like activity level and climate. Drinking water before, during, and after exercise is particularly important for maintaining performance and preventing dehydration-related complications.