All Saints' day was instituted to honour all saints, including those who have not been canonized. All Souls' Day was instituted for the souls in purgatory. The Mass on that day is offered for them.
All Saints Day falls on November 1 and honors all saints, named and unnamed, known and unknown. All Souls Day in on November 2 and on this day we pray for the poor souls waiting in Purgatory. Both...