Folder

From Totara:

The folder module enables a teacher to display a number of related files inside a single folder, reducing scrolling on the course page. A zipped folder may be uploaded and unzipped for display, or an empty folder created and files uploaded into it.

A folder may be used:

For a series of files on one topic, for example a set of past examination papers in pdf format or a collection of image files for use in student projects

To provide a shared uploading space for teachers on the course page (keeping the folder hidden so that only teachers can see it)