GitHub is the world's largest platform for version-controlled code collaboration, hosting over 420 million repositories and serving 100 million+ developers. Originally a git hosting service, it has evolved into a comprehensive platform for the entire software development lifecycle.

Core features: git repositories with pull request workflow, issue tracking and project boards, GitHub Actions for CI/CD automation, Codespaces for cloud-based development environments, Copilot for AI-assisted coding, Pages for static site hosting, and Packages for package registry.

GitHub is home to most of the world's open-source software - everything from Linux to Kubernetes, React to TensorFlow, Python to Node.js. It has become the de facto resume for developers, with your GitHub profile often mattering more than a traditional CV.

Microsoft acquired GitHub for $7.5 billion in 2018, though it continues to operate independently. Free tier includes unlimited public and private repositories. Teams ($4/user/month) adds advanced permissions. Enterprise ($21/user/month) adds SAML, audit logs, and advanced security.

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