It isn't, Halloween is the evening before All Saints Day, other than proximity in the calendar, it has nothing whatsoever to do with All Souls Day.
Halloween was originally All Souls Day or All Saints Day. The Church still celebrates it as All Souls Day.
all souls day
The Solemnity of All Saints, All Hallows, and Hallowmas are the Roman Catholic Church's names for what most people call All Saints' Day.See the related link listed below for more information:
All Hallows means all souls. All souls Day, used to be known as All-Hallows Evening (or Halloween). it was the day when the Church used to pray for the souls of all the dead, whom it believed were in purgatory, being cleansed of their sins.
All Saints day has been on the calender of the reformed Church of England since the reformation. Halloween is Eve of All Saints, that is technically the beginning of the feast.
day of the dead or El Día de los Muertos or All Souls' Day
All Saints is on the 1st of November, the day after Halloween. It is sometimes called All Hallows. Halloween is the Eve of All Hallows or All Hallows Evening. From Hallows Evening comes the word Halloween. All Souls is on the 2nd of November.
The Catholic church. They moved All Saints Day to November first and renamed it "All Hallows Day" hence the "renaming" of Sauwin to All Hallows Eve. (p.s. the day after all hallows day is known as all souls day and is commonly thought to be the reason for the correlation of Halloween and ghosts/souls.)
day of the dead is a spanish holiday, while Halloween is an American holiday. on day of the dead the spanish celebrate and honor the dead, so it is very much like all souls' day. Halloween is when you knock on peoples' doors and ask for candy. I'm pretty sure day of the dead is an official holiday but Halloween is definitely, but unfortunately, not.
It's a holiday celebration and one of the oldest, it's called different things depending on what country your from, such as Autumn Rite, All Souls' Day, All Saints Day, All Hollows Day, Samhain etc.
All Souls Day is always on November 2.
November 2nd is reserved to remember All Souls Day. All Souls day is on November 2nd except when it falls on a Sunday. Then it is celebrated on November 3rd. This is during dia de los muertos, or day of the dead. This is also basically the Mexican version of Halloween.