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Git is a version control system for tracking changes in computer files and coordinating work on those files among multiple people. It is primarily used for source code management in software development,but it can be used to keep track of changes in any set of files.

https://en.wikipedia.org/wiki/Git

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 tracking, feature requests, task management, and wikis for every project.

https://en.wikipedia.org/wiki/GitHub

https://github.com/open-source

https://github.com/explore