What is cancer? Explain what a doctor means when he or she says the cancer has "metastasized." (Provide examples)

Cancer is a disease that has abnormal cells, that begin to divide that then becomes uncontrollable and destroy the body tissue. When cancers has "metastasized" is when it spreads from one part of the body to another part of the body.

Explanation:

As an example, when cancer starts in the lung and then metastasized to the chest or to the rest of the body.