A Binder or "Binder-ready repository" is a code repository that contains both code and content to run, and configuration files for the environment needed to run it.
A common use of Binder is for sharing a Jupyter notebook in a way that the recipient can immediately execute in a browser.
[3] The Binder project maintains core libraries and documentation for running Binder services, which make those projects available, as well as BinderHub, a tool for deploying such services via common cloud computing environments.
A public BinderHub portal is hosted by the community at mybinder.org.
[4] A BinderHub lets you launch a publicly executable version of a Binder repository.