Mass books, also known as missals or prayer books, are essential for Catholics during religious services. These books contain prayers, hymns, and readings for Mass, helping the congregation to actively participate in the celebration of the Eucharist. Synonyms for mass books include missals, prayer books, service books, and liturgical books. Missals are similar to mass books but also include the Order of Mass and the prayers and readings for each liturgical year. Service books contain the texts and rubrics for the various services and rites of the Catholic Church, including sacraments and funerals. Liturgical books encompass the ritual and ceremonial texts used in Catholic worship, such as the Roman Missal and the Gradual.