Explain what the command `git clone` means and what it is used for in the Git version control system.

The git clone command is used to create a local copy of a remote Git repository. It downloads all files, commit history, and branches from the remote repository to your computer.

This is the first step when you want to start working with an existing project hosted on GitHub or another server.

Example usage:

git clone https://github.com/user/repository.git

After executing this command, you will have a local folder with the full repository content, and you can work with the code, create new branches, commit changes, and push them back.