I WONDER - What Is A Moat?

Moats were water-filled ditches surrounding castles, serving as a primary defense mechanism. They could be up to 30 feet wide and 12 feet deep. Bridges over moats were often removable or had drawbridges to prevent enemy crossing. Besides defense, moats also functioned as sewer systems for castles.

Describe how moats made it difficult for enemies to reach castle walls.

In addition to defense, what other function did moats serve?