Who is this? Where does this person work? What does this person do?
This is a pilot. A pilot works at an airport and flies planes.
Who is this? Where does this person work? What does this person do?
This is a waiter. A waiter works in a restaurant and serves food.
Who is this? Where does this person work? What does this person do?
This is a doctor. A doctor works in a hospital and helps sick people.