While a missal book is a liturgical book containing the texts and rubrics for the celebration of Mass, there are several other words and phrases that can describe similar items. A sacramentary is a type of missal used by priests and contains the specific prayers and rites for the Eucharist and other sacraments. A lectionary is a book containing the readings for Mass, while an antiphonary contains the antiphons and psalms that are chanted during the liturgy. A breviary is a book used for the Liturgy of the Hours, which is a series of prayers and readings prayed throughout the day by religious communities. All of these books are essential tools for the celebration of Catholic liturgy.