What do you understand by corrosion? Give one example of corrosion.

Explanation

### Step-by-Step Solution

1. **Definition of Corrosion**: Corrosion is the process by which metals are gradually deteriorated or "eaten away" due to chemical reactions with environmental factors, primarily oxygen and water vapor present in the atmosphere.

2. **Mechanism of Corrosion**: When metals come into contact with oxygen and moisture (water vapor), they undergo a chemical reaction that leads to their degradation. This process can be slow and may not be immediately visible, but over time, it results in the loss of material from the metal.

3. **Example of Corrosion**: A common example of corrosion is the rusting of iron. Rusting occurs when iron reacts with oxygen and water vapor in the air.

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