A mythology is a collection of stories or myths concerning a certain individual, civilization, religion, or other common beliefs. Even though most people don't believe mythology to be totally genuine, they yet regard it with respect. 

You can watch the Crash Course video for a more in-depth discussion. 

The collection of cultural expressions that members of a specific group, community, or subculture share is called folklore. Oral traditions including proverbs, poems, jokes, tales, myths, and legends fall under this category. Traditions, activities in support of traditional beliefs, and the shapes and traditions of festivals like Christmas, weddings, folk dances, and initiation ceremonies are all included in the category of folklore.

You can watch the Cask Theology video for a more in-depth discussion.