Myth is a single story in mythology. Mythology is a system of hereditary stories of antiquity which was believed to be true to a particular cultural or religious group. In Christianity it was believed that Adam and Eve were the first man and woman respectively. These stories serve to explain the status quo of the universe and provide a rationale for some customs, rituals and establish rules by which people conduct their lives. Some myths are related to social rituals and are part of sacred ceremonies. If the protagonist of a myth is a human being rather than supernatural being the story becomes a legend. If the story concerns supernatural beings but not gods and the story is not a part of a systematic mythology, it is classified as a folktale. Myths help human beings to cope with the impossibility to prevent the reality and the course of events by way of scientific advances and rationality. So, myth is best understood not as a collection of fixed and final stories but an ever-changing process that is expressed in oral and written narratives and involves the diverse ways in which these narratives are received and appropriated.