Leave blank if there is no title, or if you are copyrighting a group of works. If you are registering a website, list the URL (www.example.com) – Whatever you enter here will appear on your official Copyright Office Registration to identify the work. If this is a group of unpublished works in a single application, do not provide a "collection" title. Later on, when uploading your work, you will be asked to provide titles for each individual work, and each title must match the file name.