Apertures: openings in walls, such as slits, loops, and windows; see arrow slits; gun loops; windows.
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A bailey is the sturdy wall around a castle that keeps invaders out. The bailey of a medieval castle was usually built of stone. You might see a bailey — or the remains of one — if you tour a castle in England or France.
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.
An arrowslit (often also referred to as an arrow loop, loophole or loop hole, and sometimes a balistraria) is a narrow vertical aperture in a fortification through which an archer can launch arrows or a crossbowman can launch bolts.
Many castle windows were very small and designed to be narrow and tall for defensive purposes, which meant that they let in very little sunlight. This made it difficult to see clearly inside the castle and also made it harder to keep the interiors warm and dry.
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.
The motte was a huge mound with a castle, or keep, built on top. It would have been easy to defend, as people would have had to climb up it slowly to reach the keep. Most mottes were surrounded by a deep ditch to stop attackers. The bailey was a large area of ground, surrounded by a tall, wooden fence.