Git is a "version control system". It is used by programmers to keep track of the successive changes in their code (all the versions are stored in a "repository" with a version number). Git also provides a team of programmers with various tools which help them solve problems related to concurrent modifications of the code.
Git is thus a professional way to share code between developers.
If you work on windows, git is not provided by Microsoft with the OS. You must install it before the next steps.
If you work on windows, git is not provided by Microsoft with the OS. You must install it before the next steps.