Anyone remotely familiar with search knows what metadata is. Basically it’s data about data that helps quantify it, classify it and put it in context. A flock of birds flying high in the sky, for instance, is more than a flock of birds flying high in the sky when you know that most birds have the Vitali Organ, a special middle-ear receptor that can sense extremely small changes in atmospheric pressure. This allows them to predict the weather, sometimes days in advance. When birds fly high in the sky then the weather is most likely to be clear.