A collection of videos is a directory (the container) containing both video files and directories that have video files in them. Videos indexes a collection in this format, and generates a HTML/JS Single Page Application (SPA) that allows you to browse and view videos in your collection. The SPA UI is much easier to use than using a filesystem browser; and the SPA, along with the collection can be trivially served over a network by putting the collection and the SPA in a directory served by nginx or Apache.