How are stories that are passed on through the oral traditions illustrate a culture while to shape it?

Oral tradition, or oral lore, is a form of human communication where in knowledge, art, ideas andcultural material is received, preserved and transmitted orally from one generation to another. The transmission is through speech or song and may include folktales, These stories, traditions, and proverbs are not static, but are often altered ... (cited from wiki, hope it helps )