Understanding the .git/description File
The Git-directory serves as the heart of any Git-repository, housing metadata, object databases, and configuration files. Among these is the description file, a simple plain-text document. Its primary purpose is to provide a human-readable summary of the project for the GitWeb interface, which is a stock web interface that comes with Git.
When a developer executes the git-init command, Git creates this file with the default content: 'Unnamed repository; edit this file description to name the repository.' While it remains a standard part of the Git-internals, its relevance has diminished in the era of modern hosting platforms. Services such as GitHub and GitLab ignore this file entirely, preferring to store repository descriptions in their own internal databases via their web interfaces or APIs.
For those managing self-hosted repositories via Git-daemon or Instaweb, the description file is still used to populate the 'Description' column in the project list. Detailed specifications on how GitWeb interacts with this file can be found in the official Git documentation and the Pro Git book.