Explain what is meant by metastasis.

Explanation

**Step-by-Step Solution:**

1. **Definition of Metastasis**: Metastasis refers to the process by which cancer cells spread from the original (primary) site of the tumor to other parts of the body.

2. **Property of Cancer Cells**: Metastasis is a characteristic feature of cancer cells, distinguishing them from normal cells. Unlike normal cells, which typically remain in their designated area, cancer cells have the ability to migrate.

3. **Mechanism of Migration**: The migration of cancer cells can occur through two main pathways:
- **Lymphatic System**: Cancer cells can enter the lymphatic system, which is a network of vessels that help in the transportation of lymph fluid throughout the body.
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