What Is Git?

Git is a distributed version control system that records the full history of a project, letting many people change the same codebase without overwriting each other.

Git is the tool that powers nearly every modern software project. It tracks every change to your files, remembers who made it and why, and lets you branch off to try ideas without disturbing the main line of work. Because it is distributed, every clone is a full copy of the history, which is also what makes it the natural source of truth for CI/CD.

What Git actually does

At its core Git takes snapshots of your project each time you commit. Rather than storing diffs, it stores the state of the whole tree and reuses unchanged files, so history is fast to navigate. Every snapshot is identified by a content hash, which means history is tamper-evident: change anything in the past and every later hash changes too.

Distributed by design

Unlike older centralized systems, Git gives every developer a complete copy of the repository, including all history. You can commit, branch, and inspect the log entirely offline, then sync with others through a shared remote such as GitHub when you are ready. There is no single point of failure in the history itself.

A first look at the commands

A typical day touches only a handful of commands. You stage changes, commit them with a message, and push to a remote so teammates and CI can see them.

The everyday Git loop

git add .
git commit -m "Add login form validation"
git push origin main

How Git underpins CI/CD

CI/CD systems watch a Git repository and react to changes. A push or a pull request is an event; the CI server checks out the exact commit, builds it, and runs tests. Because every commit has a unique identifier, a pipeline run can be tied precisely to the code it tested, which is essential for reproducible builds and reliable deployments.

Why teams rely on it

Full history makes it easy to find when and why a bug appeared.
Branching lets work proceed in parallel without conflict.
Content hashes give a trustworthy, reproducible record of every build.
Remotes provide a shared source of truth that CI can build from.

Key takeaways

Git is a distributed version control system that snapshots your project history.
Every commit has a unique content hash, making history reproducible and tamper-evident.
CI/CD pipelines build from Git, reacting to pushes and pull requests.