The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.
The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
The file extension .tar.xz is a composite format that tells a story about Unix philosophy and data efficiency. When a user downloads zlib-1.2.13.tar.xz , they are handling a file that has undergone a two-step process:
Exploring zlib 1.2.13: The Latest in Data Compression Technology zlib1213tarxz