The word folklore was first used by the English antiquarian William Thoms in a letter published by the London Journal Athenaeum in 1846. Folklore is the body of expressive culture, including tales, music, dance, legends, oral history, proverbs, jokes, popular beliefs, customs, and so forth within a particular population comprising the traditions (including oral traditions) of that culture, subculture, or group. It is also the set of practices through which those expressive genres are shared. The academic and usually ethnographic study of folklore is sometimes called folkloristics.
Folklorist William Bascom states that folklore has many cultural aspects, such as allowing for escape from societal consequences. In addition, folklore can also serve to validate a culture (romantic nationalism), as well as transmit a culture's morals and values. Folklore can also be used to assert social pressures, or relive them, in the case of humor and carnival.
In addition, folklorists study medical, supernatural, religious, and political belief systems as an essential, often unspoken, part of expressive culture.
Many rituals can be considered folklore, whether formalized in a cultural or religious system (e.g. weddings, baptisms, harvest festivals) or practiced within a family or secular context. For example, in certain parts of the United States (as well as other countries) one places a knife, or a pair of scissors, under the mattress to "cut the birth pains" after giving birth. Additionally, children's counting-out games can be defined as behavioral folklore.