State the composition of sweat.

Explanation

**Step-by-Step Solution:**

1. **Introduction to Sweat**: Sweat is a fluid produced by the sweat glands in the skin. It plays a crucial role in thermoregulation and excretion.

2. **Main Component - Water**: The primary component of sweat is water, which makes up the majority of its composition. Water helps in regulating body temperature through evaporation.

3. **Electrolytes**: Sweat contains electrolytes, with sodium chloride (NaCl) being the most significant. Sodium and chloride ions help maintain the body's electrolyte balance.

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