Cybersecurity and Infrastructure Security Agency (CISA) is a branch of the US Department of Homeland Security, responsible for identifying, assessing, and protecting critical infrastructure sectors from cyber threats and physical vulnerabilities.
Critical Infrastructure are those assets, systems, and networks that provide functions necessary for our way of life. There are 16 critical infrastructure sectors that are part of a complex, interconnected ecosystem and any threat to these sectors could have potentially debilitating national security, economic, and public health or safety consequences.