Explanations to a 4 year old

As of today, these are some questions my 4 year old and I are wrestling with:

What is the Government ?

What does the President do ?

What is the coronavirus ?

Methinks the last one is easiest to comprehend and explain - It is a germ. It makes you sick. Keep washing your hands to get it off so it doesn't make you and others sick.

In the present day, the answers to all three questions may be indistinguishable from each other.