Define electrolysis.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Term**: The term "electrolysis" is derived from two parts: "electro" which refers to electricity, and "lysis" which means to break down or decompose.

2. **Definition**: Electrolysis can be defined as the process of decomposing a substance by passing an electric current through it.

3. **Explanation**: During electrolysis, an electric current is used to drive a chemical reaction that would not occur spontaneously. This process typically involves the breaking down of ionic compounds into their individual elements or simpler compounds.

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