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what does git commit do

Gitcommit takes a “snapshot” of your staged changes and saves it into your repository’s history, creating a new point you can always refer back to or roll back to.

Quick Scoop: What does git commit actually do?

Think of git commit as pressing Save + Bookmark on your project’s current state (but only for files you’ve staged with git add). It doesn’t upload anything to GitHub or other remotes by itself—that’s what git push is for. Instead, it writes a permanent record into your local repo.

When you run git commit:

  • It takes all changes from the staging area (index) and stores them as a new commit object in .git.
  • It creates a snapshot of your files at that moment in time.
  • It records metadata : author, timestamp, a unique hash (ID), and a message you write.
  • It links to a parent commit , forming a chain of history you can move through.

You can imagine each commit as a “save point” in a video game: you can move forward freely, but if something breaks, you can jump back to any earlier save.

Mini sections

1. In plain terms

If someone asks you “what does git commit do?” you can safely say:

  • It captures a snapshot of the staged changes in your project.
  • It adds that snapshot to your project history as a new commit.
  • It does not automatically send changes to GitHub or any remote.
  • It gives that snapshot a message and unique ID so you can find it later.

A very common usage:

bash

git add file1.py file2.js
git commit -m "Add new login validation"

This stages your changed files, then creates a commit with a short descriptive message.

2. What happens under the hood?

Internally, Git stores four main object types, and one of them is the commit object.

  • The commit object points to a tree object that represents your directory structure.
  • The tree object points to blob objects that hold your actual file contents.
  • The commit also stores:
    • Parent commit(s) (the previous snapshot).
* Author and committer information.

* The commit message.

As a verb, “to commit” in Git means “store the current staged state as a new snapshot and moveHEAD to point at it.”

3. Common git commit variants

Some frequently used forms:

  • git commit -m "message" – Commit staged changes with a short message.
  • git commit -a -m "message" – Automatically stages all tracked modified files, then commits.
  • git commit --amend – Modify the most recent commit (message and/or content).

From the official documentation, git commit has many more options (--template, --cleanup, trailers, etc.), but in day‑to‑day work you mostly rely on -m, -a, and sometimes --amend.

4. Why commits matter in real projects

Good commits give you:

  • Traceability – You can see what changed, who changed it, and why.
  • Safety – Each commit is a “safe” version Git won’t alter unless you explicitly rewrite history.
  • Collaboration – Team members can review commits, comment on them, or revert specific ones without touching others.

Guides often recommend that each commit be focused and have a clear, imperative message , like “Add search bar” instead of “Added search bar,” to read like a command applied to the repo.

5. Forum-style take: how devs describe it

On Q&A forums, you’ll often see people summarize it like this:

“A commit is an individual change to a file (or set of files). Every time you commit, Git creates a new ID and stores a snapshot of the project as it was when you ran git commit.”

And another common phrase:

“Commits are your save points ; git add prepares the changes, git commit locks them into history, and git push shares them with others.”

Simple HTML table (for quick reference)

html

<table>
  <tr>
    <th>Aspect</th>
    <th>What git commit does</th>
  </tr>
  <tr>
    <td>Scope</td>
    <td>Saves only staged (or auto-staged with -a) changes into history as a new snapshot. [web:1][web:3][web:5]</td>
  </tr>
  <tr>
    <td>Data stored</td>
    <td>Snapshot of tracked files, author, timestamp, parent commit, and message. [web:1][web:3][web:8]</td>
  </tr>
  <tr>
    <td>Location</td>
    <td>Stored locally in the repository’s .git directory as commit objects. [web:1][web:3][web:5]</td>
  </tr>
  <tr>
    <td>Analogy</td>
    <td>Acts like a save point or checkpoint in your project’s timeline. [web:5][web:9]</td>
  </tr>
  <tr>
    <td>Not doing</td>
    <td>Does not upload to remote; that’s what git push is for. [web:5]</td>
  </tr>
</table>

TL;DR: git commit records a versioned snapshot of your staged changes, with a message and metadata, creating a permanent checkpoint in your project history that you can review, compare, or revert to later.

Information gathered from public forums or data available on the internet and portrayed here.