GitHub and Git vs GitHub

1. What is GitHub?

What is GitHub?

GitHub is a cloud-based platform used to host Git repositories and help development teams collaborate on software projects.

Git manages the source code history, while GitHub provides a central place where developers can store and share their Git repositories.

For example, you may have a Git repository on your computer:

Local Computer
     |
     | git push
     ↓
GitHub Repository

Other developers can then obtain the project:

GitHub
   |
   | git clone / git pull
   ↓
Developer's Computer

Why Do We Need GitHub?

Suppose three developers are working on the same application:

Developer A
Developer B
Developer C
     ↓
   GitHub
     ↓
Central Git Repository

Each developer can:

• Clone the repository.
• Create branches.
• Commit changes locally.
• Push changes to GitHub.
• Create Pull Requests.
• Review other developers' code.
• Merge approved changes.
• Track issues and project work.
• Use GitHub Actions for CI/CD.

Simple Example

Clone a repository from GitHub:

git clone https://github.com/company/myapp.git

Create a branch:

git switch -c feature/login

Make changes and commit:

git add .
git commit -m "Add login feature"

Push the branch to GitHub:

git push -u origin feature/login

The flow is:

Local Repository
      |
      | git push
      ↓
GitHub Repository
      |
      | Pull Request
      ↓
Code Review
      |
      ↓
Merge

Key Points

• GitHub is a Git repository hosting and collaboration platform.
• It stores repositories remotely.
• Developers can collaborate using branches and Pull Requests.
• GitHub provides code review, issues, project management, security features, and CI/CD through GitHub Actions.
• GitHub uses Git underneath for version control.
• GitHub is not required to use Git.

2. What is the difference between Git and GitHub?

Git

Git is a distributed version control system.

It tracks changes to files and source code.

Git is normally installed on your computer:

Your Computer
     ↓
    Git
     ↓
Local Repository

Common Git commands include:

git init
git status
git add .
git commit
git branch
git merge
git pull
git push

You can use Git without GitHub.

For example:

git init
git add .
git commit -m "Initial commit"

All of this can happen entirely on your local computer.

GitHub

GitHub is an online service that hosts Git repositories and provides collaboration features.

Developer Computer
       |
       | Git
       ↓
Local Repository
       |
       | push / pull
       ↓
GitHub
       |
       ↓
Remote Repository

For example:

git push origin main

Here Git performs the version-control operation, while GitHub may be the server hosting the remote repository.

Git vs GitHub

Simple Architecture

Developer 1
Local Git Repository
       |
       | push
       ↓
    GitHub
Remote Git Repository
       ↑
       | pull
       |
Developer 2
Local Git Repository

Git performs operations such as:

commit
branch
merge
rebase

GitHub provides collaboration around those repositories:

Remote hosting
Pull Requests
Code reviews
Issues
GitHub Actions
Team collaboration

Important Interview Point

Do not say:

Git and GitHub are the same.

They serve different purposes.

A simple way to remember is:

Git manages the source-code history; GitHub hosts Git repositories and provides collaboration features around them.

Key Points

• Git = Version Control System
• GitHub = Git repository hosting and collaboration platform
• Git works locally and does not require GitHub.
• GitHub is one of several Git hosting platforms.
• Alternatives include GitLab, Bitbucket, and Azure Repos.
• Commands such as git commit, git branch, and git merge are Git commands, not GitHub commands.
• git push and git pull are Git commands used to communicate with remote repositories, which may be hosted on GitHub.