What is a redox reaction ?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Redox Reaction**:
A redox reaction, short for reduction-oxidation reaction, is a type of chemical reaction where oxidation and reduction occur simultaneously.

2. **Understanding Oxidation and Reduction**:
- **Oxidation**: This process involves either the addition of oxygen to a substance or the removal of hydrogen from it.
- **Reduction**: This is the opposite process, which involves the addition of hydrogen to a substance or the removal of oxygen from it.
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