Water is perhaps the most important chemical substance known. Without it, the very existence of life would be questionable. Yet its detailed structure and behaviour in the condensed phase and the interfaces between the condensed phase and its environment remain somewhat controversial. Indeed as ever more sophisticated and novel experimental and theoretical tools are applied to the study of bulk liquid water and ice and its interfaces, it is becoming increasingly clear that this disparate information could heat the debate on the phase and interface behaviour of water rather than cool it! This book plans to achieve a unification of views towards the goal of understanding the microscopic structure and behaviour of condensed phases of water at interfaces and progressing into the bulk.