There are so many parts of the castle like the castle moat. Castle moats were used mostly for defensive purposes, they were also used prevent mining under the castle. They were filled with water or wooden stakes to create a barrier for men and their horses. Next were castle dungeons. These were intended for holding the prisoners and for certain cases they were used for torturing them. They also included murder holes. Castle Murder Holes were also used for defensive purposes, these were holes in the ceiling of the castle gateways, barbicans, or passageways which heavy missiles or other kinds of dangerous substances could be thrown on the enemies soldiers. T hen we have the castle drawbridge. The castle drawbridge was again used for defensive purposes, it was consisted of a wooden platform with a 1 hinged side fixed to the castle wall and the other side raised by rope or chains. The purpose of this was to prevent an easy entry to the castle. The next part of the castle was the castle portcullis. This was used for defensive purposes, it was a heavy grilled door that was suspended from the gatehouse ceiling. It was lowered quickly in times for attack, the ropes would be rapidly slashed or rapidly released, it would come down blocking the entrance, then the spikes would impale the enemy. Next is castle crenellations. They were used for defensive and attack purposes, it was built around the top of a castle with gaps for arrows, it provided a platform to fight on and from which soldiers launched arrows, also it provided defenders (also called battlement) had a defense to hide behind. Then there is the castle gatehouse. the gatehouse as also used defensive and attack purposes, it was a structure built over the gateway of the castle, the main entry would be heavy barred, it also might be defended by the barbican.
They also have castle machicolations. These were used for defensive purposes, they were platform situated at the top of the castle wall, some spanned the whole battlement, and others protruded from wall like the balconies. The purpose of this was to provide clear access across the battlement, enabling the soldiers to follow the attack point rapidly. they also had a balcony style machicolations, it had holes in the floor for dropping missiles on the enemy. Next we have castle battlement. They were used for defensive and attack purposes also, parts of this were called the Crenels, these were 2-3 feet wide gaps and they also had Merlons, which is a solid portion between to crenels. Then we have castle loopholes, they were also used for defensive and attack purposes (like many others). Loopholes were narrow vertical windows, and castle defenders launched arrows from the position. They were different sizes and designs, which also depended on the shape of the weapons. Next is the castle barbican. It was used for defensive and attack purposes, this was an exterior defense situated at the entrance of the Medieval Castle which confined the enemy in the passageway. Next is the castle curtain wall. they were just used for defensive purposes, the curtain surrounded the castle buildings, it varied in sizes 6-20 feet thick and up to 45 feet high and up to 1500 feet long. Then we have the castle bastion, it was used for defensive and attack purposes, it was small tower, which was situated at the corners of the castle. the purpose of this was to cover the dead ground or you can say blind spots. Finally we have the castle keep. It was used for defensive purposes, it was the tower that was built as the most protected part of the castle, at first they were squared shaped and then they moved on to circular shaped to reduce the risk of attack.
They also have castle machicolations. These were used for defensive purposes, they were platform situated at the top of the castle wall, some spanned the whole battlement, and others protruded from wall like the balconies. The purpose of this was to provide clear access across the battlement, enabling the soldiers to follow the attack point rapidly. they also had a balcony style machicolations, it had holes in the floor for dropping missiles on the enemy. Next we have castle battlement. They were used for defensive and attack purposes also, parts of this were called the Crenels, these were 2-3 feet wide gaps and they also had Merlons, which is a solid portion between to crenels. Then we have castle loopholes, they were also used for defensive and attack purposes (like many others). Loopholes were narrow vertical windows, and castle defenders launched arrows from the position. They were different sizes and designs, which also depended on the shape of the weapons. Next is the castle barbican. It was used for defensive and attack purposes, this was an exterior defense situated at the entrance of the Medieval Castle which confined the enemy in the passageway. Next is the castle curtain wall. they were just used for defensive purposes, the curtain surrounded the castle buildings, it varied in sizes 6-20 feet thick and up to 45 feet high and up to 1500 feet long. Then we have the castle bastion, it was used for defensive and attack purposes, it was small tower, which was situated at the corners of the castle. the purpose of this was to cover the dead ground or you can say blind spots. Finally we have the castle keep. It was used for defensive purposes, it was the tower that was built as the most protected part of the castle, at first they were squared shaped and then they moved on to circular shaped to reduce the risk of attack.