Halloween evolved from a Celtic holiday wherein people lit bonfires and dressed up in costumes to scare off spirits. As a result, the custom continues today, with individuals donning costumes, passing out “trick-or-treat,” and carving jack-o-lanterns.

Halloween is a holiday held on October 31, particularly in Western countries, to commemorate the eve of the Christian feast of All Hallows’ Day, which honors all the church’s saints. Historians think that Halloween or Hallowe’en originated with an ancient Celtic holiday in which people lighted bonfires and dressed up in costumes to scare away spirits.

According to one version, Halloween evolved from the ancient Celtic festival of Samhain, which commemorated the end of a bountiful summer harvest and the start of the “dark, frigid winter,” which was then associated with death and decay.

As a result, the Celts celebrated Samhain on the night that marked the transition from summer to winter, when they lit massive bonfires devoted to their gods and begged for protection from evil spirits over the approaching winter.

The Celts, who lived 2,000 years ago largely in what is now northern France, the United Kingdom, and Ireland, believed that the line between the worlds of the living and the dead was blurred on the night between summer and winter.

They thought that the ghosts of the dead returned to the world on October 31, which turned out to be a suitable date for the festival because the Celts celebrated their new year on November 1

People dress up in scary costumes and clothes, decorate their homes in spooky way, scare people, eat candy, and sip pumpkin spiced drinks at modern-day Halloween celebrations.