Final answer:
European feudal society operated through a hierarchical structure of lords and vassals. It was a mutually supportive system providing security and resources for both parties.
Step-by-step explanation:
The feudal system in European society was a hierarchical structure of lords and vassals. Lords owned the land and granted land-grants called fiefs to their vassals in exchange for their military service and loyalty. In return, the vassals received protection from the lord. This system was mutually supportive as it provided security and resources for both the lords and the vassals.