The feudal system in 100 words

Father Francois, you are my honored guest. Please allow me to explain the Feudal system to you before you ask any questions of me. I am but a simple farmer. The feudal system allows people to own property in exchange for services to a higher lord. For example, king William has a large amount of people whom he trusts and if they need anything such as land they provide their services to the lord. The person who requires help is called the vassal and the person who assists him is the lord. This system can continue through all the nobles.