The role of the parody in Don Quixote is that they want to put out the different perspectives and diversity thinking that people have towards something. “Thirty or more enormous giants with whom I intended to do battle and whose lives I intend to take” In this quotes Don Quixote is referring to a windmills, but he liked to see them as giants because that's just how optimistic he really is. The real significance behind this scene/quote is that he doesn’t see something everyone usually see it because Sancho tells Don Quixote he is confused they aren't giants they are windmills. I think that is the real meaning behind the role of the parody is to show that everyone has different perspectives on things and everyone will not think the same.
