GitHub

GitHub is a website and cloud service for hosting Git repositories and collaborating on code. Developers push their Git repositories to GitHub to back them up, share them and work on them together, and it hosts most of the world's open-source projects.

Git is the version control tool that runs on your computer; GitHub is a service built around it. GitHub adds pull requests for reviewing and merging changes, issues for tracking bugs and tasks, GitHub Actions for CI/CD automation, GitHub Pages for free static websites and Copilot for AI coding help. GitLab and Bitbucket are alternatives.