Git Submodules Cloning a Git repository having submodules
Example
When you clone a repository that uses submodules, you'll need to initialize and update them.
$ git clone --recursive https://github.com/username/repo.git
This will clone the referenced submodules and place them in the appropriate folders (including submodules within submodules). This is equivalent to running git submodule update --init --recursive immediately after the clone is finished.
