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Github is used to upload your code to back it up. You can also use the public code like you want, just make sure you respect the licence ;)
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GitHub, Inc. is a United States-based global company that provides hosting
for software development version control using Git. In 2018, it became a
subsidiary of Microsoft for US$7.5 billion.
It offers the distributed version control and source code management
functionality of Git, plus its own features.
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GitHub is a web-based Git or version control repository on the Internet with
a hosting service. It offers the distributed version control and source code
management (SCM) functionality of Git as well as adding its own new features.