Fundamental concepts: revisions, working copy, repository, branch, baseline, trunk

A component of software configuration management, version control, also known as revision control or source control, is the management of changes to documents, computer programs, large web sites, and other collections of information.

Revision (also version): version is any change in form.

The repository is where files' current and historical data are stored, often on a server. Sometimes also called a depot.

Branch. A set of files under version control may be branched or forked at a point in time so that, from that time forward, two copies of those files may develop at different speeds or in different ways independently of each other.

Baseline (tag, label) – an approved revision of a document or source file from which subsequent changes can be made (commit in git).

Trunk – the unique line of development that is not a branch (sometimes also called Baseline, Mainline or Master). In the trunk-based development model, all developers work on a single branch with open access to it. Often it’s simply the master branch. They commit code to it and run it.