The Department of Homeland Security (DHS) is a cabinet-level agency of the United States federal government responsible for ensuring the safety and security of the country and its citizens. The DHS was established in the aftermath of the September 11, 2001, terrorist attacks and is responsible for a wide range of functions, including:
Border security: DHS is responsible for securing the country's borders and enforcing immigration laws, including the management of the U.S. Customs and Border Protection (CBP) and the U.S. Immigration and Customs Enforcement (ICE).
Counterterrorism: DHS works to prevent and respond to acts of terrorism within the United States, through the work of agencies such as the Federal Emergency Management Agency (FEMA) and the Transportation Security Administration (TSA).
Cybersecurity: DHS is responsible for protecting the nation's critical infrastructure and cyberspace from cyber attacks and cyber-related threats, through the work of the Cybersecurity and Infrastructure Security Agency (CISA).
Emergency management: DHS works to respond to and recover from major disasters and emergencies, including natural disasters, acts of terrorism, and other large-scale events, through the work of FEMA.
Research and development: DHS conducts and supports research and development activities to improve its security capabilities and address emerging threats, through the work of the Science and Technology Directorate (S&T).
Overall, the DHS is tasked with protecting the United States against a wide range of threats and promoting the safety and security of the American people.