Multipolar means there are more than two influential/great power. Personally, I think this is better than the current state of US being the sole superpower, or during the cold war when there was two rival superpowers. However, some people argue that a multipolar world is not more stable (it led to World War I). I'm not an expert myself, but since we've got more democracies now than the time before World War I, I would argue that a multipolar world composed of mostly democratic countries might work.