The Media Manager is a very useful tool for uploading or deleting files in the <joomlaroot>/images/ directory on your web server. You can upload new files, delete existing ones, and create sub-directories. The Media Manager offers two views: thumbnails view and details view. The first (thumbnails view) will show a preview of the image files. The second (details view) will show the file name, dimensions, and file size. There is also a handy 'delete' button next to each file.