Information Science evolved in the last few decades from peripheral studies of other disciplines which used the concept of information with a more or less common-sense meaning, to a fully-fledged discipline with a growing toolkit of concepts and methods of inquiry. This does not mean that the concept of information acquired a unique definition across research and application fields or that there is a consensus regarding its theoretical description. However no nontrivial concept of science or philosophy has such unchallenged, uniform formulation. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).