Fairy tales are found in oral form (passed on from mouth to mouth) and in literary form (written down). Fairy tales' histories are hard to find. This is because only written fairy tales can be passed on for a long time. Still, literary works show that there have been fairy tales for thousands of years. Many fairy tales today have are based on very old stories that have appeared, though in different ways, in many different cultures around the world. Fairy tales, and works based on from fairy tales, are still written today.