This is a celebration observed on October 31 in many countries. It is also known as the Western Christian Feast of all Saints. This celebration begins with the three days of observance of the feast of all Saints. In the liturgical year, the feast of all saints is the time that is specially dedicated to remembering those who are no longer in this world, including martyrs and saints.
There is a common belief that most Halloween traditions come from the Samhain Gaelic Festival, one of the ancient Celtic harvest festivals. In addition, people believe that the roots of these festivals are pagan. Finally, it was the church itself that Christianized Samhain to be Halloween.