A missal is a book used in the Roman Catholic Church that contains the texts and prayers needed for the celebration of the Mass. It includes the order of the service, readings from the Bible, and various prayers that are recited by the priest and the congregation. Missals can be specific to certain seasons or occasions, such as the Advent or Easter seasons. There are different types of missals, including the Roman Missal, which is the official liturgical book for the celebration of the Mass in the Latin Rite. Some missals are designed for personal use, allowing individuals to follow along during the service, while others are intended for use by clergy.