Differentiate between benign and malignant tumours.

Explanation

**Step-by-Step Solution:**

1. **Definition**:
- **Benign Tumours**: These are non-cancerous growths that do not invade nearby tissues or spread to other parts of the body.
- **Malignant Tumours**: These are cancerous growths that can invade nearby tissues and have the potential to spread (metastasize) to other parts of the body.

2. **Spread**:
- **Benign Tumours**: They remain localized to one organ and do not spread to other areas.
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