What is hydrogenation? What is its industrial application?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Hydrogenation**:
Hydrogenation is the process of converting an unsaturated organic compound into a saturated organic compound through the addition of hydrogen. This process is essentially a reduction reaction.

2. **Understanding Unsaturated and Saturated Compounds**:
- **Unsaturated Compounds**: These compounds contain one or more double or triple bonds (pi bonds) between carbon atoms. Examples include alkenes and alkynes.
- **Saturated Compounds**: These compounds contain only single bonds (sigma bonds) between carbon atoms, meaning they do not have any pi bonds. Examples include alkanes.
...