GitLab is a platform based entirely on Git, a distributed versioning system that is made available as open source software. Git is by far the most widely used VCS in the world. Its main purpose is to save and document all changes to files and their source code so that they can be traced at any time. GitLab is particularly interesting for developers and programmers and makes their daily work easier. When using a version control system, several programmers can collaborate and develop simultaneously, for example by working on different features, enable peer code review and automate continuous integration and delivery.