GitHub Enterprise is the on-premises version of GitHub.com. GitHub Enterprise includes the same great set of features as GitHub.com but packaged for running on your organization's local network. All repository data is stored on machines that you control, and access is integrated with your organization's authentication system (LDAP, SAML, or CAS).
Reference:
https://www.azuredevopslabs.com/labs/azuredevops/yaml/
https://enterprise.github.com/faq