Frequently Asked Questions
Answers about critical infrastructure, sectors, resilience and the site's safety scope.
What is critical infrastructure?
It is infrastructure whose prolonged loss can seriously affect essential public functions, safety, health, economic activity or social continuity. Definitions vary by jurisdiction.
How many critical infrastructure sectors are there?
In the United States, CISA currently organizes critical infrastructure into 16 sectors. Other countries use different classifications.
Why are interdependencies important?
Power, communications, water, transportation and digital services often depend on one another, so disruption can cascade across sectors.
Does this site contain hacking or sabotage instructions?
No. Cybersecurity and physical-security content is defensive and conceptual only.
Why were old WordPress articles consolidated?
The old site repeated smart-grid, telecom, water, data-center, transportation, cybersecurity and resilience topics under many similar titles.