Answer :
Lord require serfs to use his mill and winepress to collect a portion of the serfs' harvest.
Serfdom was a social status in medieval Europe in which a tenant farmer was subject to his landlord's whim and confined to an inherited piece of land. The great majority of serfs in medieval Europe were subsistence farmers, working a lord's property for their own benefit. This was the key characteristic separating serfs from slaves, who were bought and sold without consideration of a piece of land. The serf supplied his own food and clothes via his own useful labor. The lord had to get a sizeable percentage of the grain that the serf grew on his estate. Additionally, the lord had the right to order the serf to work any property belonging to him that wasn't already occupied by other tenants.
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