Git

Git is a distributed version control system designed to handle everything from small to very large projects with speed and efficiency. Developed by Linus Torvalds in 2005 for Linux kernel development, Git allows multiple developers to collaboratively work on source code by tracking changes and maintaining the integrity and history of each modification. Unlike older centralized systems, Git works locally on a developer's machine, allowing them to make and experiment with changes independently before sharing them with others.

It's most important innovation is that it allows source code control to be decentralized.