The US Fish and Wildlife Service, also known as FWS or Fish and Wildlife agency, is a federal agency responsible for the management and conservation of fish, wildlife, and their habitats in the United States. Another term that could be used to refer to this agency is the National Wildlife Refuge System. The FWS is also responsible for administering the Endangered Species Act, which aims to protect species that have been identified as threatened or endangered. The agency can also be referred to as simply the Wildlife Service or the Bureau of Fish and Wildlife. Overall, the FWS plays an important role in protecting and preserving the natural resources of the United States.