Tonight begins Yom HaShoa, the Jewish Day of Remembrance for the Holocaust, remembering the six million, or roughly half the world's Jews, that were killed in the Holocaust.
https://www.myjewishlearning.com/article/yom-hashoah-holocaust-memorial-day/
While International Holocaust Remembrance day is was January 27th, when we remember all victims of the Holocaust, today is the Jewish Day of Holocaust Remembrance.