The United States Fish and Wildlife Service is a federal agency tasked with protecting and conserving the country's wildlife and natural resources. It is also known by a variety of synonyms, including the USFWS, Fish and Wildlife Service, and the FWS. Other terms that can be used to describe this agency include the National Wildlife Refuge System, the National Fish Hatchery System, and the Endangered Species Program. Additionally, the agency's primary focus on the management and restoration of fish and wildlife habitats has led to it being referred to as the Habitat Conservation Service and the Wildlife Resource Agency. These synonyms are all used interchangeably to refer to the important work done by this agency in protecting our nation's natural heritage.