万圣节起源于古代凯尔特人的传统节日，被称为“萨温节”（Samhain）。这是一年中最重要的节日之一，也是冬季的开始。在这一天，凯尔特人相信死亡与生命之间的界限变得模糊，鬼魂和恶魔会出现在人间。人们会穿上面具和服装，以此来躲避邪灵的侵扰。

随着基督教的兴起，万圣节被纳入了基督教的日历中。这一天被称为“万圣节”，意为“所有圣徒的节日”。在这一天，人们纪念已故的基督教圣徒，以及所有已经去世的亲人和朋友。传统上，人们会在万圣节前夕去教堂祈祷，同时点燃蜡烛和烛台。

如今，万圣节已经成为了一个全球性的节日，人们会在这一天穿上各种各样的服装，参加派对和游行。糖果也成为了这个节日的一部分，孩子们会在街上敲门要糖果。

总的来说，万圣节是一个充满了神秘和庆祝的节日，它不仅反映了古代文化传统，也体现了基督教的信仰和纪念。它的意义在于纪念已经去世的人们，同时也是一个让人们放松和享乐的节日。

英文翻译：

Halloween originated from the ancient Celtic traditional festival known as "Samhain". It was one of the most important festivals of the year and marked the beginning of winter. On this day, the Celts believed that the boundary between life and death became blurred, and ghosts and demons would appear in the world. People would wear masks and costumes to avoid the evil spirits.

With the rise of Christianity, Halloween was incorporated into the Christian calendar. This day was called "All Saints Day", which means "the festival of all saints". On this day, people commemorate deceased Christian saints, as well as all deceased relatives and friends. Traditionally, people would go to church to pray and light candles and candlesticks.

Today, Halloween has become a global festival, and people wear various costumes to participate in parties and parades. Candy has also become a part of this festival, and children go door-to-door asking for candy.

Overall, Halloween is a festival full of mystery and celebration, reflecting not only ancient cultural traditions but also Christian beliefs and commemorations. Its significance lies in commemorating the deceased while also being a festival for people to relax and enjoy themselves.