GitHub is a hosting provider for git repositories which was founded in 2008. Microsoft acquired GitHub in 2018. GiiHub now has more features than just hosting repositories.
As GitHub, Micorsoft has it’s own Git repository hosting which is the default one if you are using Azure Devops. This is called Azure Debops Git. More information can be found at https://docs.microsoft.com/en-us/azure/devops/repos/get-started/what-is-repos?view=azure-devops.
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