Electrolytes are minerals — sodium, potassium, chloride, magnesium — that manage your fluid balance and let nerves and muscles fire. You lose some in sweat, which is exactly why sports drinks were invented. The catch: they were designed for prolonged, intense exercise — think roughly an hour or more of genuinely sweaty effort, or heavy sweating in heat. That's when replacing sodium and quick carbs mid-activity earns its keep.
For a regular workout, a walk, or a normal day, water plus your next meal replaces everything you lost — food is naturally full of electrolytes. Outside that endurance context, a sports drink is functionally sugar water, often carrying 20+ grams per bottle. The trendy electrolyte powders are mostly harmless but mostly unnecessary too, and some pack a notable dose of sodium — the one electrolyte most people already eat too much of.