Object database

Git stores file contents and history information in its object database. This database is located in .git/objects. Git objects are identified by hash values based on their contents; objects with identical content can have the same identity.

.git/objects/
├── 1a/
├── 4f/
└── info/

Objects are usually stored in compressed form and read by Git when needed.

A blob object stores file content, while a tree object represents directory structure and links between filenames and objects. A commit object contains a reference to a tree, author and date information, a commit message, and links to parent commits when present.

Commit
  └── Tree
       ├── Blob (index.html)
       └── Blob (style.css)

This structure allows Git to reconstruct a project's file tree and history at a particular point in time.