Answer:
Whereas the Department of Defense is charged with military actions abroad, the Department of Homeland Security works in the civilian sphere to protect the United States within, at, and outside its borders. Its stated goal is to prepare for, prevent, and respond to domestic emergencies, particularly terrorism.
The important role of the Department of homeland security is to safeguard the threats pertaining to the nation from internal issues or outsiders.
Department of homeland security is the US based department which works for border security, aviatation security, anti-terrorism and to curb the cyber crimes in the nation.
It also looks after the protection of the nation leaders and the cybersecurity and infrastructure.
Thus department of homeland security plays a very diversified role regarding safety of its own nation.
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