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Day of the Dead (Spanish: Día de Muertos) is a Mexican holiday celebrated throughout Mexico and around the world in other cultures. The holiday focuses on gatherings of family and friends to pray for and remember friends and family members who have died. It is particularly celebrated in Mexico, where it is a national holiday, and all banks are closed. The celebration takes place on November 1 and 2, in connection with the Catholic holidays of All Saints' Day and All Souls' Day.

Traditions connected with the holiday include building private altars honoring the deceased using sugar skulls, marigolds, and the favorite foods and beverages of the departed and visiting graves with these as gifts. They also leave possessions of the deceased.

Scholars trace the origins of the modern Mexican holiday to indigenous observances dating back hundreds of years and to an Aztec festival dedicated to the goddess Mictecacihuatl.

In most regions of Mexico, November 1 is to honor children and infants, whereas deceased adults are honored on November 2. This is indicated by generally referring to November 1 mainly as Día de los Inocentes ("Day of the Innocents") but also as Día de los Angelitos ("Day of the Little Angels") and November 2 as Día de los Muertos or Día de los Difuntos ("Day of the Dead").
Source: Wikipedia