Cloner is a Laravel package that provides a trait for Eloquent models to duplicate models, their relationships, and file attachments. The core functionality resides in the Cloner service class which handles the cloning process, including relationship traversal and file duplication via an adapter pattern. The package supports cloning to the same or different database connections (with limitations for many-to-many relations across databases) and fires events during the cloning process. It is designed as a reusable library for Laravel applications, with a service provider for easy integration.