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This way a branch defines its own line of descendants in the overall version graph formed by all commits in the repository.You can create a new branch from an existing one and change the code independently from other branches.which means that you can work on different versions of your collection of files.

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Typically, there is a central server for keeping a repository but each cloned repository is a full copy of this repository.

The decision which of the copies is considered to be the central server repository is pure convention.

A version control system (VCS) allows you to track the history of a collection of files.

It supports creating different versions of this collection.

A developer can copy (checkout) a certain version from the central sever onto their individual computer.