What group was bound to the land and worked for the vassals?

The group bound to the land and worked for the vassals were known as serfs. In the feudal system, serfs were peasants who were tied to a specific piece of land and were obligated to provide labor and services to the landowner or vassal in exchange for protection and the right to work a portion of the land for their own subsistence. They had limited rights and could not leave the land without the lord's permission.