A manor house is the home of a lord of a manor. A fortified manor house is such a house with provision for defence. To the modern eye, fortified manor houses look very much like castles. Many of them had moats, turrets, windows for archers, and so on.
The answer with the link below has a little more information, and a picture of a fortified manor house.
No, castles were not often parts of manors. Most manors were held by members of the untitled lesser nobility, who could not afford to build castles. In many cases, the most they could afford to build was a relatively comfortable manor house. The manor was an agricultural estate. One of its early purposes was to provide a knight with the land and production needed to provide for his horses. It also gave him an income to cover the costs of armor, and so on. It was a large estate, usually with a village, where serfs lived and there might be small workshops. It had a manor house for the lord. And it had lots of land so the food for all its residents could be grown. There were tens of thousands of these estates in a country like England or France. If the lord was quite wealthy and felt the need to do it, he might fortify the manor house, in which case the manor house looked rather like a castle. But there were fundamental differences between a castle and a fortified manor house, one of which was that the fortified manor house did not have a ward or keep. This meant that the fortified manor house was very much smaller. Castles usually required some sort of special permission from a monarch to be built. Kings very often had unlicensed castles torn down. The numbers of castles were kept down, so as to prevent their use in rebellions. Only people considered trustworthy had them, and these people were either royal or of the highest levels of nobility.
Prevost Manor House was created in 1794.
Philipsburg Manor House was created in 1693.
Wigborough Manor House was created in 1585.
Widcombe Manor House was created in 1656.
A castle was a fort, and a manor house was the home of the lord of an estate. They were not the same thing; though a manor house could be fortified, and if it were looked very like a castle; and a castle could be used by the lord of an estate as his home. A castle usually had a curtain wall and a ward or courtyard, and a fortified manor usually did not, and that might distinguish a castle used as a home from a fortified manor house. Oh heck, the difference depended on what the lord called it.
Knights were nobles so they lived as nobles. They had manors, estates, or castles. --- Kinghts lived in manor houses. A simple manor house could be a large house on an estate. An expensive manor house could be almost palatial. There were fortified manor houses that looked very much like castles.
Manor houses were of two types, those that were fortified and those that were not. Those that were fortified were generally built of stone and looked quite a lot like castles. Those that were not fortified were generally built of timbered construction, but were better built than most houses and the areas between timbers were more likely to be filled with brick than with wattle and daub. There is a link below to a related question on manor houses.
Fortified dwellings of the Middle Ages were castles and fortified manor houses. Not all dwellings were castles, however.
The manor house was the home of the lord of the manor. Peasant children did not get much opportunity to go into the manor house.
No, castles were not often parts of manors. Most manors were held by members of the untitled lesser nobility, who could not afford to build castles. In many cases, the most they could afford to build was a relatively comfortable manor house. The manor was an agricultural estate. One of its early purposes was to provide a knight with the land and production needed to provide for his horses. It also gave him an income to cover the costs of armor, and so on. It was a large estate, usually with a village, where serfs lived and there might be small workshops. It had a manor house for the lord. And it had lots of land so the food for all its residents could be grown. There were tens of thousands of these estates in a country like England or France. If the lord was quite wealthy and felt the need to do it, he might fortify the manor house, in which case the manor house looked rather like a castle. But there were fundamental differences between a castle and a fortified manor house, one of which was that the fortified manor house did not have a ward or keep. This meant that the fortified manor house was very much smaller. Castles usually required some sort of special permission from a monarch to be built. Kings very often had unlicensed castles torn down. The numbers of castles were kept down, so as to prevent their use in rebellions. Only people considered trustworthy had them, and these people were either royal or of the highest levels of nobility.
Manor House Museum was created in 1892.
Manor House Publishing was created in 1998.
Lansing Manor House was created in 1819.
Manor House Stables was created in 2006.
Capel Manor House was created in 1971.
Wigborough Manor House was created in 1585.