Feudalism helped protect communities from the violence and warfare that broke out after the fall of Rome and the collapse of strong central government in Western Europe. Feudalism secured Western Europe's society and kept out powerful invaders. Feudalism helped restore trade. Lords repaired bridges and roads.
It can identify your target audience
Creating an audience profile, you will be able to see the social and economic characteristics of your audience, that will allow you to identify your target audience.
You didn't indicate which piece of glass art the question is about
No, you always need to provide a citation.