How did serfs become serfs in the economic system based on manorialism?

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Serfdom was a form of unfree labor that was tied to the land they worked on. Serfs were typically peasants who were born into their position and passed down their status to their children. They were bound to the lord of the manor and were required to provide labor and various services in exchange for protection and the use of land for subsistence farming. Serfdom was a hereditary condition and there was no way to become a serf through application or purchase.

How Did Serfs Become Serfs in the Economic System Based