What was the purpose of motte and bailey castles over time?

Motte and bailey castles served as a strategic fortification system during the medieval period, primarily designed for defense and as a base of control over surrounding territories. The motte, a raised earthwork, provided a stronghold for the lord and his garrison, while the bailey, an enclosed courtyard, facilitated the storage of supplies and housing for soldiers and livestock. Over time, these castles evolved into more complex structures, reflecting advancements in military architecture and the need for improved defenses against sieges and attacks. They played a crucial role in establishing feudal authority and served as centers of administration and local governance.