The Yard (or Bailey or Ward): An open courtyard inside the castle walls. Loopholes: Narrow slits in the walls (also called embrasures, arrow slits, or arrow loops) through which soldiers could shoot arrows at the enemy.
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In this wall were gaps or spaces called crenels, which were usually square or rectangular and placed at regular intervals. They're the distinct two- to three-foot-wide gaps you see at the very top of castle walls. Sometimes crenels are also called embrasures.
In some castles, there is an inner bailey that is an enclosed area closer to the tower or keep, and an outer bailey which is an area further out from the tower but that is still protected by the curtain wall. Windsor Castle is an example of a castle with a motte and a bailey.
Putlog holes or putlock holes are small holes made in the walls of structures to receive the ends of poles (small round logs) or beams, called putlogs or putlocks, to support a scaffolding. Putlog holes may extend through a wall to provide staging on both sides of the wall. Putlog holes in Cardiff castle.
Batter (Plinth) The angled lower part of a tower or wall. Missiles dropped from the top of the towers or wall onto the plinth cause them to richochet horizontally into the attackers doing more damage. Plinths also strengthened the bases of the towers or walls and also made it harder to undermine them.
In architecture, a turret is a small tower that projects vertically from the wall of a building such as a medieval castle. Turrets were used to provide a projecting defensive position allowing covering fire to the adjacent wall in the days of military fortification.
In medieval fortification, a bretèche or brattice is a small balcony with machicolations, usually built over a gate and sometimes in the corners of the fortress' wall, with the purpose of enabling defenders to shoot or throw objects at the attackers huddled under the wall.
A moat is a deep, broad ditch, either dry or filled with water, that is dug and surrounds a castle, fortification, building, or town, historically to provide it with a preliminary line of defence.
The most important room in a castle was the Great Hall. This is where all the members of the household sat down to eat at tables set up for every meal. It was where feasts were held for special days, or when there were guests. King Arthur's Pentecost Feast takes place in such a Hall.
external features - such as towers battlements, thick walls, a moat, a drawbridge, etc. internal features - such as a well, large stores to guard against siege, a hall for everyone to socialise.