<human>:  Can you explain the history behind the Mexican Day of the Dead?
<bot>: The Mexican Day of the Dead, or 'Día de Muertos,' originates from pre-Columbian indigenous observances. The Aztecs and other native groups celebrated a yearly festival dedicated to Mictecacihuatl, the goddess of the underworld. This was a month-long festival, typically in late July or early August, where families would gather to remember and honor their deceased loved ones. This tradition was blended with the Catholic observances of All Saints Day and All Souls Day, creating a syncretic faith. Today, the Day of the Dead is celebrated from October 31 to November 2, with the focus of commemorating those who have departed from this world. Families build ofrendas (altars) in homes and cemeteries, and decorate them with vibrant colors and the favorite foods and drink of the deceased, while they gather to remember and tell stories of the departed's life.