Day of the Dead (Spanish Día de Muertos, Día de los Muertos or Día de Todos Santos "All Saints 'Day") is a Mexican holiday for the dead celebrated by the Catholic celebrations of All Saints' Day and the Feast of the Dead, celebrated from the evening of October 31 to November 2. It is the most popular and important holiday in Mexico, understood as a happy reunion between the living and the dead, and is also celebrated in countries with a Mexican diaspora. It represents a syncretic tradition combining elements from the pre-Christian religions of Mexico, especially Aztec, with Spanish elements, which in turn synthesize church and folk traditions.