A sandbox URL is a URL that is used for testing purposes. It typically points to a development or staging environment where new features and changes can be tested without affecting the live production environment. Sandbox URLs are usually only accessible to a limited number of users, such as developers and testers, and are not intended for use by the general public.

On the other hand, a live URL is a URL that is used in the production environment and is accessible to the general public. It points to the live version of a website or application and is used for accessing the actual services and features that the website or application provides.