Object Model

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Git stores data as four types of objects: Blobs (file contents), Trees (directories mapping names to blobs/trees), Commits (snapshots pointing to a tree with metadata), and Tags (named references to commits). All objects are immutable and content-addressed.

Key Properties

• Blob Objects
• Tree Objects
• Commit Objects

Related

• SHA-1 Hashing (how objects are addressed)
• The DAG (commit graph structure)

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git internals object-model