Mass is one of the names by which the sacrament of the Eucharist is commonly called in the Catholic Church, Western Rite Orthodox churches and many Old Catholic, Anglican, and Lutheran churches, as well as some Methodist churches.
The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with more than 1.27 billion members worldwide.
A sacrament is a Christian rite recognised as of particular importance and significance.
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Apart from "Eucharist" others are the "Lord's Supper", the "Breaking of Bread", the "Eucharistic assembly ", the "memorial of the Lord's Passion and Resurrection", the "Holy Sacrifice", the "Holy and Divine Liturgy" and "Holy Communion".
Divine Liturgy is the Eucharistic service of the Byzantine Rite which is the Rite of the The Great Church of Christ and was developed from the Antiochene Rite of Christian liturgy.
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In these denominations, the term Mass often refers to the entire church service in general.
In Christianity, a church service is a formalized period of communal worship, often but not exclusively occurring on Sunday, or Saturday in the case of those churches practicing seventh-day Sabbatarianism.
Some Protestants employ terms such as Divine Service or service of worship, rather than the word Mass, although other Protestants, such as Anglicans and Lutherans, use the word.
For the celebration of the Eucharist in Eastern churches, including those in full communion with the Holy See, other terms such as the Divine Liturgy, the Qurbono Qadisho or Holy Qurbana and the Badarak are normal.
Holy Qurbana or Holy Qurbono, the "Holy Offering" or "Holy Sacrifice", refers to the Eucharist as celebrated according to the East Syrian and the West Syrian traditions of Syriac Christianity.
The Holy See is the ecclesiastical jurisdiction of the Catholic Church in Rome, the episcopal see of the Pope, and an independent sovereign entity.