GitHub is a web-based Git or version control repository and Internet hosting service. It is mostly used for code. It offers all of the distributed version control and source code management (SCM) functionality of Git as well as adding its own features. It provides access control and several collaboration features such as bug trackingfeature requeststask management, and wikis for every project.

GitHub offers both plans for private and free repositories on the same account which are commonly used to host open-source software projects.  As of April 2017, GitHub reports having almost 20 million users and 57 million repositories, making it the largest host of source code in the world.

GitHub has a mascot called Octocat, a cat with five tentacles and a human-like face.

GitHub

Development of the GitHub platform began on 1 October 2007.  The site was launched in April 2008 by Tom Preston-WernerChris Wanstrath, and PJ Hyett after it had been made available for a few months prior as a beta release.

Projects on GitHub can be accessed and manipulated using the standard Git command-line interface and all of the standard Git commands work with it. GitHub also allows registered and non-registered users to browse public repositories on the site. Multiple desktop clients and Git plugins have also been created by GitHub and other third parties that integrate with the platform.

The site provides social networking-like functions such as feeds, followers, wikis (using wiki software called Gollum) and a social network graph to display how developers work on their versions (“forks“) of a repository and what fork (and branch within that fork) is newest.

A user must create an account in order to contribute content to the site, but public repositories can be browsed and downloaded by anyone. With a registered user account, users are able to discuss, manage, create repositories, submit contributions to others’ repositories, and review changes to code.

The software that runs GitHub was written using Ruby on Rails and Erlang by GitHub, Inc. developers Chris Wanstrath, PJ Hyett, and Tom Preston-Werner.

Scope

GitHub is mostly used for code.

In addition to source code, GitHub supports the following formats and features:

  • Documentation, including automatically rendered README files in a variety of Markdown-like file formats (see README files on GitHub)
  • Issue tracking (including feature requests) with labels, milestones, assignees and a search engine
  • Wikis
  • Pull requests with code review and comments
  • Commits history
  • Graphs: pulse, contributors, commits, code frequency, punch card, network, members
  • Integrations Directory
  • Unified and split diffs
  • Email notifications
  • Option to subscribe someone to notifications by @ mentioning them.
  • Emojis
  • GitHub Pages: small websites can be hosted from public repositories on GitHub. The URL format is http://username.github.io.
  • Nested task-lists within files
  • Visualization of geospatial data
  • 3D render files that can be previewed using a new integrated STL file viewer that displays the files on a “3D canvas”.
  • The viewer is powered by WebGL and Three.js.
  • Photoshop‘s native PSD format can be previewed and compared to previous versions of the same file.
  • PDF document viewer

Courtesy:  wikipedia

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