A more thorough explanation:

A navy yard is a piece of land where ships are built for the United States Navy. It also includes the surrounding waters that are needed to float the ships.

• The Norfolk Naval Shipyard in Virginia is a navy yard where ships are repaired and modernized.
• The Brooklyn Navy Yard in New York City was once a major navy yard that built battleships and aircraft carriers.

These examples show how navy yards are important facilities for the United States Navy. They are where ships are built, repaired, and maintained to keep them in good condition for use in the Navy's operations.