Answer;
-It was surrounded by walls and a moat.
-It was a private world, set apart for the imperial court.
-It was the emperors home, office and retreat.
Explanation;
The Forbidden City is the largest and best-preserved imperial palace complex in the world.
The Forbidden City used to be the imperial palace in the Ming and Qing Dynasties, and ordinary people were not allowed in without permission. Hence, it was called the "Forbidden" City.
The Forbidden City served as the home of emperors and their households as well as the ceremonial and political center of Chinese government for almost 500 years.