The salt which is required by our body for maintaining balance and carrying on daily activities are called electrolytes. They are electrically charged ions and carry either positive charge or negative charge. The ions which are positively charged are called cations and which are negatively charged is called anions. These ions are vital for keeping balance of water content in your body and for maintaining the pH balance. Whenever you sweat, you lose some quantity of ions. You can replenish them by drinking lot of fluids.