What is the homeland presidential policy directive-21?

Presidential Policy Directive 21 (PPD-21) is a directive issued by the U.S. government in 2013 that focuses on strengthening the resilience of critical infrastructure against various threats, including cyberattacks and natural disasters. It outlines a national approach to enhance the security and resilience of critical infrastructure sectors by promoting collaboration between government and private sector stakeholders. PPD-21 emphasizes the importance of risk management and information sharing to protect the nation’s assets and maintain essential services.