In an age of uncertainties influenced by information technologies and the networking of societies, the maritime domain remains the main global lane of communication, vital for trade and security. The European Union has become a maritime actor, carrying out counter-piracy and maritime capacity-building operations and actively dealing with maritime safety, fisheries protection, port security, maritime surveillance and counter-immigration at sea. The Union's policies, mechanisms and activities related to the maritime domain are now backed by a Maritime Security Strategy, adopted by the Council in June 2014. This cutting edge book accounts for the trends in maritime strategy and seapower politics as well as the recent developments in the field, both at the conceptual and practical level. It discusses the significance of the maritime domain for European security in general and for the EU in particular. Readers are provided with the necessary tools to critically assess the EU's potential as a global maritime actor and evaluate why Europe's prosperity and security rests on its capacity to shape events at sea.