Editorial - Introductory remarks on Discussion & Debate: Rogue Waves - Towards a Unifying Concept?

This short editorial contains the introductory remarks for the special issue discussions and debates on the subject of rogue waves. This issue is the first of its kind, in the sense that the authors have the chance to discuss the basic concepts of an emerging topic in science. Based on these discussions, an attempt to give a definition of a rogue wave is made.