GitHub
In plain terms
The largest platform for hosting and collaborating on Git repositories.
Going deeper
GitHub hosts code with collaboration features like pull requests, issues, and actions, central to open source and team development. It's the social hub of code.
Under the hood
Adds PRs, code review, CI (Actions), and project management atop Git; owned by Microsoft.
Examples
Open source, code hosting, pull requests, CI/CD, collaboration, Copilot.
Think of it like...
Like a social network and workshop combined for code.