What is the difference between All Saints' Day and All Souls' Day?

All Saints' Day, also called Allhallows or Allhallowmas, is observed Nov. 1 by Protestants and Roman Catholics in celebration of Christian saints - particularly those who don't have their own feast days. All Souls' Day is recognized Nov. 2, mainly by Catholics, in remembrance of the dead.

source Columbus Dispatch Nov. 1, 2008, - (Holidays, Festivals and Celebrations of the World Dictionary)