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CISA, short for the Cybersecurity and Infrastructure Security Agency, is a standalone United States federal agency under the Department of Homeland Security (DHS). Established through the Cybersecurity and Infrastructure Security Agency Act of 2018, CISA is tasked with enhancing the security, resilience, and reliability of the nation's cyber and physical infrastructure.

In the context of information security, CISA plays a pivotal role by collaborating with the public and private sectors to defend against threats to the nation’s cybersecurity. The agency is responsible for protecting government networks and providing cybersecurity tools, incident response services, and assessment capabilities to safeguard the ‘.gov’ domain. CISA also coordinates security efforts, shares information on threats and vulnerabilities, and offers guidance and best practices to support cybersecurity risk management for critical infrastructure sectors. The agency's work strengthens the nation's defenses against cyber attacks and supports the protection of critical data across industries.