This chapter explores that cyber power provides the strategist with a flexible tool that can make a limited, but potentially important, contribution to strategy. It discusses the existential threat posed by cyberattack. The chapter presents the various elements of cyber strategy. It focuses on how cyber power actually functions as an instrument of policy. The chapter describes a call for a unified, comprehensive approach to cyber strategy. Cyberspace has a physical infrastructure layer that follows the economic laws of rival resources and the political laws of sovereign justification and control. From a general security perspective, the statistics concerning cyberattacks are compelling and make sober reading for information-age societies. In response, governments are investing substantial resources and creating new organisations to exert cyber power and protect the nation’s cyber infrastructure. Cybersecurity is perhaps the best-understood component of cyber strategy. Low-level cyberattacks and cyber intrusions are an everyday occurrence.