The document discusses version control systems (VCS) like Git. It explains what a VCS is, how it works, and why it is useful. Specifically, it covers how Git allows developers to collaborate on software projects by managing changes to source code over time through committing and branching functionality. The document also promotes an open source project on GitHub called tddbc as an example of using a VCS and provides a link to its code repository.

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99. https://github.com/kwappa/
tddbc/tree/master/dwtddbc01

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