What is the connection between literature and folklore?

In fact, folklore is the ancestor of any literature. Indeed, in the works of oral folk art, the worldview and cultural characteristics of a particular people are described. That is why many poets and writers often use folk motives in their work.
It can also be said that it was in folk works that the division into genres began. For example, epics or songs were performed with a certain rhythm, sometimes they had rhymed lines. Fairy tales or stories are similar to modern prose.