What is the Divine Office?
This is what St. Benedict calls the Opus Dei, the work of God, namely the different prayers of the Church that punctuate the day, and through which honor, glory and adoration are rendered to the Most Holy Trinity. It is also called the Breviary, for this is the name of the book that contains the prayers of the Divine office that Subdeacons, Deacons and Priests are bound to recite every day.