Are there similarities and differences between "non-legacy" dance and traditional folk dance? Why?

Folk literature and art refers to literary and artistic works with certain ethnic, regional or social group characteristics, which are created orally by the masses and passed down orally, and constantly revised, processed, preserved and developed in the process of being passed down from generation to generation. It is a national cultural heritage of a country. Intangible cultural heritage refers to all kinds of traditional cultural expressions handed down from generation to generation by people of all ethnic groups and regarded as part of their cultural heritage, as well as physical objects and places related to traditional cultural expressions.