The Department of Defense officially codified its understanding of cyberspace as a warfighting domain with the publication of the National Military Strategy for Cyberspace Operations. In this document, cyberspace is defined as a domain characterized by the use of electronics and the electromagnetic spectrum to store, modify, and exchange data via networked systems and associated physical infrastructures. According to this definition, cyberspace is a very real, physical domain that is comprised of electronics and networked systems that use electromagnetic energy. Cyberspace exists across the other domains of air, land, sea, and space and connects these physical domains with the cognitive processes that use the data that is stored, modified, or exchanged. (bye, via and thanks for the fish)