Horseman, for all intents and purposes, is a internet-accessible database, we've just constructed a Content-Management-System (CMS) on top of it to make it easy to use. Internally, it does all of the things you'd expect a normal database to do, but it does it everywhere around the world. All without colliding or having concurrency issues.
Whats a Headless CMS?A headless CMS is a Content-Management-System that doesnt have a frontend of its own.