All Souls' Day, also known as the Feast of All Souls, is observed worldwide every November 2 as a day of prayer for the departed. The celebration follows All Saints' Day and is officially recognized in the liturgical books of the Western Catholic Church as the Commemoration of All the Faithful Departed. The date was established by Saint Odilo of Cluny for monasteries associated with Cluny Abbey, and it later became the official day of prayer for the dead in the Western Church. On this day, many people focus on remembering and praying for deceased relatives, visiting cemeteries to clean tombs and decorate graves with flowers. In some cultures, it is customary to leave food on graves as a tribute. In several countries, All Souls' Day is recognized as a public holiday, often alongside All Saints' Day, including nations such as Poland, Mexico, and Brazil.