What is a castle for a feudal lord?

The castle for the feudal lord is both a fortress and a home. In the Middle Ages, feudal lords often fought among themselves, in this connection, each of them thought about their own protection and the protection of their wealth. Thus, they erected well-fortified fortresses for themselves in hard-to-reach places (near a swamp, near a river, on a cliff, etc.). This is how the castles appeared. The castle itself, on the one hand, was a fortress, and on the other, it had a housing complex and other outbuildings (a stable, a smithy, a pantry, a kitchen, etc.).