Git clone is a command line in Git which is used to create a clone or create a copy of an existing target repository.
The main purpose of Git clone is if a project has already been set up in a central repository then we can use the git clone command to obtain a development copy. Cloning is a one-time operation i.e. once a developer cloned the working copy then all version control operations and collaborations can be managed through their local repository itself.
For more information, check out this GIT Tutorial.
You can watch this video on GIT and Docker to get started: