What does clone form do?

The Clone Form function allows you to duplicate or copy a form using the URL. You may also clone your own form under your account. This will copy the layout, format, conditions and some settings.

Here are some helpful guides:
How-to-Clone-an-Existing-Form-from-a-URL
How-to-clone-an-existing-form-from-your-account

Hope that helps. Thank you.