Answer:

The novel coronavirus that first appeared in China had never been seen before, so it quickly gained the attention of scientists around the world. An outbreak is called an epidemic when there is a sudden increase in cases. As COVID-19 began spreading in Wuhan, China, it became an epidemic. But then the disease went spread across several countries and affected a large number of people and there it was classified as a pandemic.

These are the terms i knew that i used here on my answer and it could possibly help you too;

Pandemic: Event in which a disease spreads across several countries and affects a large number of people.

Epidemic: Sudden increase in cases of a disease.

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