Differentiate between nuclear fusion and nuclear fission.

Explanation

### Step-by-Step Text Solution

1. **Definition**:
- **Nuclear Fission**: This is a process where the nucleus of an atom splits into two or more lighter nuclei, along with the release of energy.
- **Nuclear Fusion**: This is a process where two or more light atomic nuclei collide and combine to form a heavier nucleus, also releasing energy.

2. **Energy Release**:
- **Nuclear Fission**: When an atom undergoes fission, a significant amount of energy is released, but it is relatively less compared to fusion.
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