Electrolytes play a crucial role in maintaining fluid balance and are essential for proper nerve and muscle function. They help regulate hydration, blood pressure, and the body's overall electrolyte balance. During intense exercise or prolonged physical activity, significant amounts of electrolytes can be lost through sweat. Replenishing these via sports drinks or electrolyte-rich foods prevents issues such as muscle cramps, fatigue, and dehydration, maintaining optimal performance and overall health.