Mythopoeia is like telling stories about made-up creatures and places that we can imagine in our minds. Just like how we may pretend to be unicorns or fairies when we play with our friends, some people like to create their own stories and myths about things that don't really exist in the real world. These stories can have heroes and villains, magical powers, and adventures that are exciting to imagine. It's like creating your own little world that is all yours to explore and imagine in.