Question

WHO WHERE SERFS AND WHAT IS FEUDALISM

Answer 1

feudalism is the process in which the lord offered land to the vassals in return of protection and loyalty. serfs where the people who worked on the lands of the knights given by the nobles.
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Answer 2

serfs were
Serf is the status of many peasants under feudalism, specifically relating to manorialism. It was a condition of bondage, which developed primarily during the High Middle Ages in Europe and lasted in some countries until the mid-19th century. 

feudalism are
Feudalism was a combination of legal and military customs in medieval Europe that flourished between the 9th and 15th centuries. Broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour