What is a medieval castle?

Answer 1

A castle is a fort. It was designed to be a place where people could stay in times of trouble. Typically it had a raised area called a motte, a curtain wall or palisade, and an open area within the wall called a bailey. Early castles were made of wood, and later ones made of stone. The stone castles usually had a large building called a keep, which often looked like a large tower. There was a gate house with a gate that could be easily defended. Often the castle was surrounded by a moat and getting to the gate meant crossing a drawbridge. The moat was often full of water.

There is a link to an article on castles below.

Answer 2

A castle is a place of royalty and in medevil times it was used as a place to defend your town. E.g motte and baily castle

Answer 3

It's an American TV series starring Nathan Fillion.