Undoubtedly, of all the ancient festivals, Yule (Old Scandinavian jól, Old English ġéol) is the most important, most sacred and most powerful winter holiday. On these nights, all worlds converge in Midgard: gods and goddesses descend to earth, trolls and elves talk to people, the dead come out of the Lower Worlds. Those of the people who often communicate with the Other World leave their bodies for a while and join the riders of the Wild Hunt (oskorei - riders of Asgard) or become werewolves and other spirits.
Also, Yule is the days of the great feast and holiday, in which all members of the clan gathered together in order to meet the Sun again, which had risen from darkness, and survey the reborn world. It is no coincidence that the elements of the holiday are preserved in the Christian Christmas - for example, an evergreen tree, symbolizing life, which will continue after the winter cold.
The origin of the word Yule is lost in the mists of time. Most likely, it goes back to the Indo-European root with the meaning "to rotate", "to spin", "wheel". Perhaps it means "turning time", "turning of the year", "time of sacrifice" or "dark time".