An electrolyte and a nonelectrolyte .

Explanation

**Step-by-Step Solution:**

1. **Definition of Electrolyte:**
- An electrolyte is a substance that dissociates into ions when dissolved in water. This means that when an electrolyte is added to water, it breaks apart into positively and negatively charged ions.

2. **Types of Electrolytes:**
- Electrolytes can be classified into two categories:
- **Strong Electrolytes:** These substances completely dissociate into ions in solution. For example, sodium chloride (NaCl) is a strong electrolyte because it fully separates into Na⁺ and Cl⁻ ions in water.
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