Information is data within a context. On the expression “3 degrees Celsius”, “3” is data and “degrees Celsius” is the context. In usability terms, information is often referred to what the user needs: accurate information instead of more information which might lead to information overflow.
In the context of information theory, the value of the information contained in a message is refered to as entropy, which "is a measure of the uncertainty in a random variable". ( http://en.wikipedia.org/wiki/Entropy_%28information_theory%29, retrieved 2013-01-13)
Questions with the information often are concerned with how to present information and convey meaning (also see semantics). Questions about hierachy or relationship of information are often more specifically tagged information-architecture.