Folk horror is a subgenre focusing on pagan practices, traditional spiritual beliefs, and isolated settings to deliver a tone of fear and dread. While supernatural entities may be involved, most folk horror movies focus on human evils, and the way faith and fear can engender acts of absolute evil. The genre more or less began with literary works like Shirley Jackson's short story "The Lottery," and hit critical mass with British horror films such as The Blood on Satan's Claw and the original version of The Wicker Man.
Source：https://www.cbr.com/best-folk-horror-films-of-the-past-decade/
