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Critical infrastructure, or critical national infrastructure (CNI) in the UK, describes infrastructure considered essential by governments for the functioning of a society and economy and deserving of special protection for national security.^[1] Critical infrastructure has traditionally been viewed as under the scope of government due to its strategic importance, yet there's an observable trend towards its privatization, raising discussions about how the private sector can contribute to these essential services.^[2]

^ Tarter, Alex (2015). "Securing Critical Infrastructure". The Military Engineer. 107 (697): 74–75. ISSN 0026-3982.
^ De Bruijne, Mark; Van Eeten, Michel (2007). "Systems that Should Have Failed: Critical Infrastructure Protection in an Institutionally Fragmented Environment". Journal of Contingencies and Crisis Management. 15 (1): 18–29. doi:10.1111/j.1468-5973.2007.00501.x. ISSN 0966-0879.