Version Control
A system that tracks every change made to files over time, letting you revert mistakes and collaborate without overwriting each other's work.
January 15, 2026
The Problem Version Control Solves
Imagine working on a project for three days, making a change that breaks everything, and having no way to undo it. Or working on the same file as a colleague and one of you accidentally deletes the other's work. These are the exact problems version control was designed to prevent.
Without version control, people used to do things like save files as report_final.docx, report_final_v2.docx, and report_ACTUAL_FINAL.docx. Version control replaces that chaos with a proper system.
How It Works
A version control system keeps a complete history of every change ever made to your files. You save a snapshot of your work at meaningful points — these snapshots are called commits. Each commit has a message explaining what changed and why.
At any point you can:
- View the full history of changes
- Revert to any earlier snapshot
- See exactly what changed between two versions
- Work on experimental ideas in a separate "branch" without touching the main code
Git is the Standard
Git is by far the most widely used version control system — it's what almost every developer, every company, and every open-source project uses. When people say "version control," they usually mean Git specifically.
Git works locally on your computer. GitHub is a website that stores your Git history in the cloud so you can collaborate with others and back up your work safely.
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