Source control (version control) records every change to your code as a revision, together with who made it, when, and why. Several programmers can edit one project at once, find the change that introduced a bug, and roll back a mistake. In 2000 Spolsky declared the free, centralized CVS "fine". Today the answer is almost always Git 1,932 , a distributed system in which every clone carries the full history. Version Control Essentials covers the everyday Git commands.
In 2026 "yes" means more than having a repository. Many teams practice trunk-based development: everyone integrates into one branch (main), feature branches live for hours or a day or two, and every change reaches main through a pull request that has been built, tested and reviewed. Branch protection rules make those checks mandatory, and configuration such as the lockfile and CI workflow is committed too.