What is the difference between “endemic”, “epidemic”, and “pandemic”?

Endemic: a disease that exists permanently in a particular region or population. Malaria is a constant worry in parts of Africa.

Epidemic: An outbreak of disease that attacks many peoples at about the same time and may spread through one or several communities.

Pandemic: When an epidemic spreads throughout the world.

Source: What is the difference between “endemic”, “epidemic”, and “pandemic”?