It's a bookmarking database that keeps a copy of all your bookmarks in your computer, but automatically syncs to your other devices. Similar to what Chrome and Safari do between your desktop and mobile devices.
Although it's built particularly for Kozmos (getkozmos.com), you can build a service that syncs with that.
P.S If you'd like to build an import manager, you can use Kozmos' parsing library; https://github.com/kozmos/bookmark-backup-parser