Folklore is the whole of oral traditions shared by a particular group of people, culture or subculture. This includes tales, myths, legends, proverbs, poems, jokes, and other oral traditions. They include material culture. Folklore also includes customary lore, taking actions for folk beliefs, and the forms and rituals of celebrations such as Christmas, weddings, folk dances, and initiation rites. Each one of these, either singly or in combination, is considered a folklore artifact or traditional cultural expression. Instead, these traditions are passed along informally from one individual to another, either through verbal instruction or demonstration. The academic study of folklore is called folklore studies or folkloristics, and it can be explored at the undergraduate, graduate, and Ph.D. levels.