Who are Peasants or serfs who worked the land?

A serf was a peasant, but not all peasants were serfs.

A peasant is usually a farmer. A peasant could be free or not, and though most were doubtless poor, we find references to well-to-do or prosperous peasants.

Serfs are peasants legally bound to a lord's land, and were not allowed to move away. Serfs usually had to provide labor in exchange for a place to live and work.