A vassal is a person in the feudal system who pledges loyalty and service to a more powerful lord in exchange for land or protection. This relationship was common in medieval Europe, where lords granted portions of their land, known as fiefs, to vassals. In return, vassals would provide military support and other services to their lords, creating a bond of mutual obligation. The concept of vassalage was crucial for maintaining order and security during times of conflict. It helped establish a hierarchy where lords held power over their vassals, while serfs worked the land. This system shaped the social and political landscape of the time.