For the need of hierarchy we have now Libraries on the top and Folders where each child of the Library that is a container for media content is called Folder.

A library is a container for files with specific extensions, generally called images, documents and videos.

A folder is a container for the media content but will have only structural presence. Folders do not have permissions, multiple urls etc.

The Libraries module allows users to easily create and manage libraries of documents, images and videos by storing them either in a library or in a depth of library with folders. This article provides information of how to manage folders using the Folders API.

To manage folders through the Folders API, you must add the following namespace to your class:

using Telerik.Sitefinity.Folders;