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Definition
Git is a distributed version control system that records changes to a set of files over time, enabling multiple people to work on the same codebase and merge their changes safely.
Simple explanation
Think of Git as a very detailed 'track changes' for code. Every time you save a meaningful set of edits, you create a 'commit' — a snapshot with a message explaining what changed and why.
Because Git is distributed, every developer has a full copy of the project's history on their own machine, not just on a central server. That makes it possible to work offline and merge everyone's changes back together later.
Why it matters
Without version control, teams overwrite each other's work, lose history and have no reliable way to undo mistakes. Git solved this problem so thoroughly that it is now the default for almost all software projects.
It also underpins modern collaboration workflows — code review, branching strategies and automated testing all assume Git is tracking the changes.
How it works
- 1InitA folder becomes a Git repository, tracking its file history.
- 2CommitChanges are saved as snapshots with a message describing them.
- 3BranchDevelopers work on separate lines of history without affecting the main codebase.
- 4MergeBranches are combined back together, resolving any conflicting edits.
- 5Push/pullLocal commits sync with a remote repository so others can see them.
Real examples
Products named for illustration only. Inclusion is not an endorsement.
- GitHubThe most widely used hosting platform for Git repositories.
- GitLabGit hosting with built-in CI/CD pipelines.
- BitbucketAtlassian's Git hosting, integrated with Jira.
- Git CLIThe command-line tool most developers use directly.
Advantages
- Tracks the full history of a project, making mistakes reversible.
- Allows many developers to work in parallel without overwriting each other.
- Works offline since every copy holds the full history.
- Underpins code review and automated deployment workflows.
Limitations
- Has a real learning curve — commands like rebase and merge conflicts confuse beginners.
- Large binary files are handled poorly without extensions like Git LFS.
- Bad commit hygiene (huge, undocumented commits) reduces its value.
- Merge conflicts still require human judgement to resolve correctly.
Common misunderstandings
- ClaimGit and GitHub are the same thing.RealityGit is the version control tool itself; GitHub is one company's hosting service built on top of it.
- ClaimCommitting automatically backs up your work remotely.RealityA commit only saves history locally until you push it to a remote repository.
Frequently asked questions
Do I need GitHub to use Git?
No. Git works entirely locally; GitHub is just one option for hosting a shared copy.
What is a commit?
A saved snapshot of changes to your files, with a message describing what changed.
What is a branch used for?
It lets you develop a feature or fix in isolation before merging it into the main codebase.
What happens in a merge conflict?
Git flags lines changed differently on two branches and asks a human to decide which version to keep.
Is Git only for code?
It works best on text files, but can track any file type, though large binaries are better handled with extensions.
The Tool Money Lab perspective
Git is one of the few pieces of developer tooling that has seen essentially no serious competitor in over a decade — its distributed model has proven the right one at every scale we have reviewed.
For non-technical readers evaluating a software vendor, whether their team uses disciplined commit history and branching is a reasonable, if indirect, signal of engineering maturity.
Conclusion
Git gives developers a reliable, distributed history of every change made to a codebase, making collaboration and recovery from mistakes practical at any scale.
It is foundational infrastructure: most modern developer tools, from IDEs to CI/CD pipelines, assume Git is quietly tracking everything underneath.