What was the main role of serfs in the feudal system?

In the feudal system, serfs were primarily agricultural laborers who worked the land owned by nobles or lords. They were bound to the land and required to provide labor, produce, and a portion of their harvest in exchange for protection and the right to work a small plot for their own subsistence. Serfs had limited rights and were often subject to the authority of their lords, forming the backbone of the agrarian economy during the Middle Ages. Their labor was essential for sustaining the feudal manor and supporting the overall structure of feudal society.