A fictional universe is a made up world that can be found in books, movies, TV shows, and other forms of creative stories. It is like stepping into another world where anything can happen. It can have its own places, characters, and rules. For example, in a book or film, a fictional universe might include a magical kingdom with wizards, witches, and mythical creatures. In a TV show, it could be something like a far-off planet with aliens, robots, and advanced technology. A fictional universe can have any kind of story or setting that the author or creator comes up with. When you read or watch something set in a fictional universe, it can be like going on an imaginary adventure.