The main socio-political system in feudal Europe was feudalism, a hierarchical structure characterized by the exchange of land for military service and loyalty. At its core, the system involved lords granting land (fiefs) to vassals in return for protection and service. Serfs worked the land for the lords and had limited rights. Feudalism shaped social classes, established local governance, and influenced economic relations. It also fostered a sense of loyalty and duty, significantly impacting the political landscape of medieval Europe until the rise of centralized monarchies.