From Border Security to Cyber Defense: How DHS Works to Keep America Safe The U.S. Department of Homeland Security (DHS) is a name often heard in news cycles, but what exactly does this vast agency do, and how does its work impact the average American? Beyond its prominent role in border security, DHS is a complex organization with a wide-ranging mandate, touching upon everything from cybersecurity to disaster response. Let's delve into the core functions of DHS and explore its vital contributions to national safety and resilience.