Electrolytes play a crucial role in hydration, particularly during exercise. They help maintain fluid balance, regulate nerve function, and support muscle contractions. Key electrolytes include sodium, potassium, and magnesium, which are essential for optimal performance. During intense workouts or extended physical activity, electrolyte loss through sweat can lead to dehydration and cramping. Replenishing them through hydration solutions or electrolyte-rich foods is vital for sustaining performance and preventing complications.