Final answer:
The feudal system was a social and economic system based on land ownership and protection, while allodial ownership refers to the absolute ownership of land without any feudal obligations.
Step-by-step explanation:
The feudal system was a social and economic system based on land ownership and protection. It involved a hierarchical structure where lords granted land, known as fiefs, to vassals in exchange for their loyalty and military service. The vassals, in turn, extracted wealth from the land through the labor of peasants. Unlike the feudal system, allodial ownership refers to the absolute ownership of land without any feudal obligations. It allowed individuals or groups to have full control over their land without owing any feudal duties to a lord.