Every developer eventually loses work — overwriting a good version of a file with a broken one, or wishing they could go back to how their code looked yesterday. Git exists to solve exactly that problem, and GitHub builds a collaborative platform on top of it.
What Git actually does
Git is a version control system that tracks every change made to a project over time, letting you save snapshots called 'commits' as you work. If something breaks, you can look back through that history and return to any earlier snapshot — a safety net most developers eventually come to rely on daily.
Where GitHub fits in
GitHub is a platform that hosts Git repositories online, adding collaboration features on top of the core version control tool — things like tracking issues, reviewing proposed changes, and merging work from multiple contributors into a shared project.
- Commit: a saved snapshot of your project at a specific point in time
- Branch: a separate line of work, useful for building a feature without affecting the main project
- Pull request: a proposed set of changes, submitted for review before merging into the main project
- Repository: the full project, including its entire history of changes
Learning Git early avoids a painful lesson many developers learn the hard way — losing hours of work with no way to recover it.
A real-world example
Two developers work on the same file at the same time — one editing a function's logic, the other fixing a typo elsewhere in the same file. Without version control, whoever saves last simply overwrites the other's work. With Git, both changes merge automatically since they touched different lines, and if they'd both changed the same line, Git would flag a merge conflict for a human to resolve — turning a silent data-loss problem into a visible, fixable one.