Git

Git is a distributed version control system that allows a developer to track changes made to files in their projects. Teams of developers can use Git to collaborate on a single project at scale. This is made possible by branching, which allows developers to make specific changes to eventually be merged into the main branch of the codebase (or Git repository).

Created as a free and open-source tool by Linus Torvalds in 2005 for development of the Linux kernel, Git is now a fundamental development tool used by almost all professional developers.

Installation instructions (for systems like Windows, macOS, and Linux) can be found here.