There is more to "Why" than merely a question. It is true that most often parents consider "Why?" a annoying question, probably because they hear it so often. But, consider the reason. It is through questions that we humans learn, especially children, who, understandably, are on the steepest learning curve. It is how you, the parent respond to the question "Why?" that is critical to learning, both for the child and the parent.
There is more to why than that simple question. We begin an exploration of your "Why" in this episode.