Explain what is meant by a change tracking system and how it is used in development.

The Version Control System (VCS) is a tool that allows developers to save the history of changes in code, manage different versions of a project, and collaborate.

In development, it is used for:

• Storing all versions of files and the ability to revert to any of them.
• Collaborative work of multiple developers without conflicts.
• Tracking who made changes and when.
• Branching and merging for parallel development of new features.

A popular example of such a system is Git. In C# projects, Git is usually used together with GitHub, GitLab, or Azure DevOps.

Basic Git commands include:

git init           # initialize a repository
git add .          # add changes to the index
git commit -m "description"  # save changes
git push           # send changes to a remote server