Well that depends on what "this" you are talking about. "This" could mean many things ranging from this forum to maybe even the very topic we're speaking in. No matter what "this" is, what needs to be known is why said whatever exists, but what does it truly mean to exist? How do we truly define that something "exists" in the first place? And this my dear friends is where the path to enlightenment truly begins. Not with the question, but with the act of trying to find the answer.