Halloween, also known as All Hallows' Eve, is a yearly celebration that originates from the ancient Celtic festival of Samhain. The festival marked the end of the harvest season and the beginning of winter, a time associated with death and the supernatural.

During the festival, people believed that the boundaries between the world of the living and the dead became blurred, and spirits could cross over into the living world. To ward off these spirits, people wore costumes and lit bonfires.

The festival was later Christianized and became known as All Hallows' Eve, the evening before All Saints' Day. It was believed that on this night, the dead could return to the living world, and people would leave food and offerings for their deceased loved ones.

Over time, Halloween has evolved into a holiday that is celebrated around the world, with traditions such as trick-or-treating, pumpkin carving, and costume parties. It remains a time to remember and honor the dead, while also enjoying the spooky and fun aspects of the holiday.