GitHub

GitHub is a developer platform operated by GitHub, Inc., a subsidiary of Microsoft. It provides hosted Git repositories and a broad set of tools for planning, writing, reviewing, securing, testing, deploying, and documenting software. The service is built around Git, the distributed version-control system created by Linus Torvalds, but extends Git with a web-based collaboration layer that includes pull requests, code review, issue tracking, project boards, discussions, wikis, access controls, notifications, and social features such as profiles, followers, feeds, and contribution graphs. The company was formed in 2007 and the GitHub website launched in 2008 after a beta period. Its founding team included Tom Preston-Werner, Chris Wanstrath, P. J. Hyett, and Scott Chacon. The platform initially became especially prominent among open-source communities because it made it simple to publish repositories, fork projects, propose changes, and merge contributions through a browser-oriented workflow. GitHub’s public repositories also became a discovery and distribution channel for software, documentation, datasets, educational material, and configuration files. During its first decade, GitHub expanded from repository hosting into a more comprehensive software-development platform. GitHub Pages enabled repository-backed static websites; Gist provided version-controlled sharing of smaller code snippets; and GitHub Enterprise offered organizations a self-managed or privately deployed version of the service. GitHub also developed integrations, security features, package distribution, code analysis, project management, and continuous integration and continuous delivery capabilities. GitHub Actions, introduced in 2018 and generally available in 2019, allowed users to define automated build, test, release, and deployment workflows using hosted or self-managed runners and reusable actions from a marketplace. Codespaces later added cloud-hosted development environments accessible through the browser or compatible development tools. Microsoft announced an agreement to acquire GitHub in June 2018 for $7.5 billion in Microsoft stock, and the transaction closed in October of that year. Microsoft said GitHub would retain operational independence as a community, platform, and business. Nat Friedman became chief executive after the acquisition, followed by Thomas Dohmke in 2021. The ownership change generated concern among some developers because of Microsoft’s history with certain previous acquisitions, and competing services reported increased interest from users considering migration. At the same time, Microsoft was already a major GitHub user and hosted many open-source projects and development resources there, making the acquisition consistent with its broader cloud and developer-tools strategy. GitHub serves individual developers, open-source maintainers, educational institutions, startups, public-sector organizations, and large enterprises. Its commercial offerings include paid individual and organization plans, GitHub Enterprise, advanced security capabilities, hosted automation, package and artifact services, and AI-assisted development tools. GitHub Copilot, developed with Microsoft and OpenAI technologies, added code suggestions and conversational assistance to the platform’s developer-productivity portfolio. GitHub Education provides learning resources and benefits for students, teachers, and schools. The platform’s scale has made it a central infrastructure layer for modern software development. In January 2023, GitHub reported more than 100 million developers and over 420 million repositories. The service has hosted a large and diverse body of public and private code, although public availability does not by itself establish that a repository meets any particular legal definition of open source. GitHub continues to operate internationally, with products and services spanning repository management, collaboration, security, automation…

GitHub’s origins trace to a collaboration among Tom Preston-Werner, Chris Wanstrath, P. J. Hyett, and Scott Chacon. Development began in 2007, and GitHub, Inc. was established in San Francisco. The web service entered beta before launching publicly in April 2008. Its central idea was to make distributed version control easier to use as a social and collaborative activity: developers could host Git repositories, publish projects, fork other repositories, discuss changes, and submit pull requests for review. The service grew rapidly through adoption by open-source developers and technology companies. During its first year online, GitHub reported tens of thousands of public repositories. It reached approximately one million repositories in 2010, surpassed two million the following year, and passed three million users and five million repositories in early 2013. By the end of 2013, the repository count had reached about ten million. GitHub’s public contribution model helped establish pull requests, issue discussions, repository wikis, contributor graphs, and fork-based collaboration as familiar parts of software development. GitHub broadened its scope beyond core repository hosting. GitHub Pages, introduced in 2008, allowed users to publish static sites from repository content. Gist provided version-controlled sharing for smaller code fragments. GitHub Enterprise, available from 2011, brought comparable functionality to organizations requiring private deployment or controlled environments. The company also added project management, discussions, integrations, package hosting, security alerts, code analysis, and educational programs. In 2015, it opened an office in Japan, its first outside the United States. The company’s governance and leadership changed after harassment allegations involving co-founder and then-chief executive Tom Preston-Werner and his wife, Theresa. Preston-Werner resigned in 2014, Chris Wanstrath became chief executive, and Julio Avalos assumed responsibility for business operations. The episode prompted organizational changes, including the introduction of additional management structures into what had previously been described as a relatively flat organization. GitHub raised substantial venture funding as its user base expanded. Andreessen Horowitz invested $100 million in 2012, and a 2015 financing round of $250 million led by Sequoia Capital valued the company at approximately $2 billion. Microsoft had become an important GitHub user through open-source projects such as .NET Core, PowerShell, Visual Studio Code, Windows Terminal, and related documentation. In June 2018, Microsoft announced its intention to acquire GitHub for $7.5 billion in stock. The transaction closed in October 2018. Nat Friedman became chief executive under Microsoft, and GitHub continued to present itself as an independently operated community, platform, and business within the Microsoft group. The acquisition caused uncertainty among some developers, who cited concerns about platform dependence and Microsoft’s record with earlier acquisitions. Competitors including GitLab and Bitbucket reported increased interest from users considering migration. GitHub nevertheless continued to expand under Microsoft. It launched GitHub Actions as a workflow-automation service, made core private-repository features available without charge to a broader audience, acquired code-analysis company Semmle in 2019, acquired npm in 2020, and established the GitHub Archive Program to preserve open-source code. GitHub also developed Codespaces, GitHub Advanced Security, GitHub Copilot, and other products that moved the brand toward an integrated software-development lifecycle platform. GitHub experienced a major DDoS attack in 2018 and later faced controversy when GitHub Enterprise Server source code appeared online in 2020. The company said the latter incident resulted from accidental distribution to Enterprise customers and was not a breach of GitHub’s production servers. In 2021, Thomas Dohmke succeeded Nat Friedman as chief executive. By 2023, GitHub reported more than 100 million developers and over 420 million repositories. The service remains a major global venue for proprietary and public software development, although hosting a public repository does not automatically mean that its contents satisfy a formal open-source license or definition.

1. 2023More than 100 million developers

   GitHub reported more than 100 million developers and over 420 million repositories.

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2. 2021Thomas Dohmke becomes CEO

   Thomas Dohmke succeeded Nat Friedman as GitHub chief executive.

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3. 2020GitHub acquires npm

   GitHub completed its acquisition of npm, strengthening its package-management capabilities for JavaScript developers.

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4. 2019GitHub Actions reaches general availability

   GitHub launched its integrated workflow automation and CI/CD service with hosted runners and reusable actions.

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5. 2018Microsoft acquisition announced

   Microsoft announced its agreement to acquire GitHub for $7.5 billion in stock.

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6. 2018Microsoft acquisition completed

   GitHub became a Microsoft subsidiary while continuing to operate as a distinct developer platform.

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7. 2015First international office

   GitHub opened an office in Japan, its first office outside the United States.

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8. 2014Leadership and organizational change

   Tom Preston-Werner resigned as chief executive, Chris Wanstrath became CEO, and the company introduced additional management structures.

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9. 2010One million repositories

   GitHub reached approximately one million hosted repositories.

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10. 2008Public launch

    GitHub launched after a beta period and introduced repository hosting, collaboration, and Git-based social workflows.

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11. 2008GitHub Pages introduced

    Repository-backed static website hosting became part of the GitHub service.

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12. 2007Development and company formation

    The founding team began developing the GitHub service and established GitHub, Inc.

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A global, community-centered developer platform that combines source-code hosting with collaborative software delivery, automation, security, and AI-assisted development.

• GitHub.comCore developer platform2008

  The primary hosted GitHub service for creating, storing, browsing, and collaborating on repositories. It combines Git version control with pull requests, code review, issues, discussions, project planning, permissions, notifications, repository wikis, and public developer profiles.

• GitHub EnterpriseEnterprise developer platform2011

  A business-focused edition that provides GitHub capabilities in controlled organizational environments. Enterprise offerings support private governance, access management, compliance requirements, security tooling, and deployment options designed for large organizations.

• GitHub ActionsCI/CD and workflow automation2019

  An automation service for defining software workflows directly in repositories. Teams use Actions to build, test, lint, package, release, and deploy software through event-driven configuration, hosted runners, self-hosted runners, and reusable actions distributed through a marketplace.

• GitHub CopilotAI-assisted development2021

  An AI-assisted development product that provides code completion, code-generation support, and conversational help within supported development environments and GitHub workflows. It is positioned as a productivity aid rather than a replacement for developer review and testing.

• GitHub CodespacesCloud development environment2021

  A cloud-hosted development environment associated with a repository. Codespaces provides configurable virtual workspaces that developers can use to edit, build, test, and run projects without installing the complete development stack locally.

• GitHub PagesStatic web hosting2008

  A repository-backed static hosting service for project sites, documentation, blogs, and personal pages. It can render Markdown-based content through Jekyll, serve sites under GitHub domains, and support custom domains and HTTPS.

• GitHub Advanced SecurityDeveloper security

  A collection of security capabilities for identifying vulnerabilities and insecure coding patterns during development. Features include code scanning, secret detection, and dependency-related security analysis for eligible repositories and enterprise customers.

• GitHub PackagesPackage and artifact management2019

  A package and artifact hosting service integrated with repositories, permissions, and Actions workflows. It supports distributing software components and build outputs within development and release processes.

• GistCode snippets2008

  A lightweight publishing service for code snippets and small text files. Each gist uses Git-based versioning and can support forking, sharing, and private or public visibility settings.

• 2020GitHub Archive Program

  Global

  GitHub established an archival initiative intended to preserve significant open-source code for very long-term access, framing public software as part of humanity’s digital record.

  Outcome. Created a preservation-oriented program alongside GitHub’s commercial platform.

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• 2018GitHub Education expansion

  Global

  GitHub expanded its education program so schools could access education-related benefits and tools, supporting classroom instruction and student software development.

  Outcome. Expanded GitHub’s role in developer education and academic software projects.

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• 2021Appoint Thomas Dohmke as CEOOther

  Nat Friedman decided to step down from the chief executive role while remaining involved with Microsoft as an advisor.

  What changed. GitHub appointed chief product officer Thomas Dohmke as chief executive.

  Aftermath. The transition placed a product and developer-tooling leader at the head of GitHub during its expansion into automation, security, cloud development, and AI assistance.

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• 2020Make core private repositories broadly freeStrategy

  GitHub sought to widen adoption among individuals and teams while maintaining paid enterprise and advanced capabilities.

  What changed. GitHub made core platform features, including private repositories with unlimited collaborators under applicable terms, available to all users.

  Aftermath. The change lowered the entry barrier for private software development and supported GitHub’s strategy of increasing platform-wide usage.

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• 2020Acquire npmM&A

  JavaScript package distribution was closely connected to repository-based development and dependency management.

  What changed. GitHub acquired npm and incorporated its registry and related capabilities into its developer-platform strategy.

  Aftermath. The acquisition expanded GitHub’s role in the JavaScript ecosystem and software supply chain.

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• 2019Launch GitHub ActionsProduct launch

  Developers were increasingly combining repository hosting with automated testing, packaging, and deployment.

  What changed. GitHub introduced a native workflow automation platform with hosted runners and a marketplace for reusable actions.

  Aftermath. Actions strengthened GitHub’s position as an integrated software delivery platform and reduced the need for separate CI/CD services in some workflows.

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• 2018Accept Microsoft acquisitionM&A

  GitHub had become a major developer platform and Microsoft was already a substantial user of its open-source and development infrastructure.

  What changed. GitHub agreed to be acquired by Microsoft in a stock transaction valued at $7.5 billion.

  Aftermath. The deal closed in October 2018. GitHub remained a distinct platform and community within Microsoft, while some users expressed concerns about independence and migration.

  Announced transaction value. $7.5 billion (2018)

  • GitLab — GitLab reported increased interest from users considering migration from GitHub.
  • Bitbucket — Bitbucket and other competing services benefited from heightened developer attention following the acquisition announcement.
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• 2020GitHub Enterprise Server source-code disclosureControversy

  Source code associated with GitHub Enterprise Server was published online in the context of a DMCA dispute. GitHub stated that the code had been accidentally shared with Enterprise customers and was not taken from production servers.

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• 2014Harassment allegations and executive resignationControversy

  Harassment allegations involving co-founder and CEO Tom Preston-Werner and his wife, Theresa, led to an investigation, Preston-Werner’s resignation, and organizational changes at GitHub.

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• 2025Thomas Dohmke announces planned departure as CEO

  Thomas Dohmke announced that he intended to leave the chief executive role at the end of 2025 to pursue entrepreneurial work.

  Leadership change
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• 2023GitHub reports more than 100 million developers

  GitHub reported surpassing 100 million developers and more than 420 million repositories.

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• 2021GitHub announces leadership transition

  Nat Friedman stepped down as chief executive and Thomas Dohmke was named his successor.

  Leadership change
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• 2020GitHub makes private repositories broadly available at no additional cost

  GitHub expanded free access so users could create private repositories with unlimited collaborators under the applicable plan terms.

  Other
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• 2020GitHub acquires npm

  GitHub announced and completed the acquisition of npm, the JavaScript package registry and related tooling business.

  M&A
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• 2018Microsoft announces agreement to acquire GitHub

  Microsoft announced a planned acquisition of GitHub in an all-stock transaction valued at $7.5 billion.

  M&A
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• 2018Microsoft completes GitHub acquisition

  The acquisition closed, with GitHub becoming a Microsoft subsidiary while retaining its platform and community identity.

  M&A
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• 2018GitHub suffers a major distributed denial-of-service attack

  GitHub mitigated a DDoS attack whose traffic peaked at approximately 1.35 terabits per second.

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1. GitHub
2. Microsoft to acquire GitHub for $7.5 billion
3. Microsoft completes GitHub acquisition
4. GitHub Actions
5. GitHub Education
6. GitHub Archive Program
7. GitHub Pages
8. GitHub is now the home for npm
9. GitHub Actions reaches general availability
10. Thomas Dohmke becomes CEO
11. More than 100 million developers
12. Make core private repositories broadly free
13. GitHub Enterprise Server源代码出现在网上
14. 托马斯·多姆克宣布计划卸任CEO
15. GitHub遭受大规模分布式拒绝服务攻击