The Office of Homeland Security is a governmental entity responsible for protecting the United States against potential threats, both domestically and internationally. However, there are several synonyms that can be used to refer to this organization. These include the Department of Homeland Security, the Homeland Security Bureau, the Homeland Defense Agency, the National Homeland Security Agency, and the Federal Emergency Management Agency. All of these names represent different aspects of the organization, but they all have the same goal in mind: to keep the country's people, infrastructure, and institutions safe and secure. Regardless of the name used, the Office of Homeland Security is an integral part of the government's efforts to protect the citizens of the United States.