Vespers is a liturgy of evening prayer, one of the canonical hours in Catholic, Eastern Orthodox, Oriental Orthodox, and Lutheran liturgies. The word for this prayer time comes from the Latin vesper, meaning "evening".
Benedictine monks singing vespers on Holy Saturday
Incensing the congregation in Advent Vespers
Orthodox priest and deacon making the Entrance with the censer at Great Vespers
Table set with five loaves, wheat, wine and oil for artoklassia
In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals. A book of hours, chiefly a breviary, normally contains a version of, or selection from, such prayers.
Opening versicle Domine labia mea aperies et os meum annuntiabit laudem tuam from a book of hours, ca. a 1520
Breviary of Beatrice van Assendelft, 1485
Cistercians singing the Liturgy of the Hours at Heiligenkreuz Abbey
Traditionally, monastic communities pray the Divine Office in the choir of the church.