The Catholic Church teaches that it is the One, Holy, Catholic and Apostolic church founded by Jesus Christ, that its bishops are the successors of Christ's apostles, and that the Pope is the successor to Saint Peter to whom primacy was conferred by Jesus Christ. It maintains that it practises the original Christian faith, reserving infallibility, passed down by sacred tradition. The Latin Church, the Eastern Catholic Churches, and institutes such as mendicant orders and enclosed monastic orders reflect a variety of theological and spiritual emphases in the church.
Of its seven sacraments the Eucharist is the principal one, celebrated liturgically in the Mass. The church teaches that through consecration by a priest the sacrificial bread and wine become the body and blood of Christ. The Virgin Mary is venerated in the Catholic Church as Mother of God and Queen of Heaven, honoured in dogmas and devotions. Its teaching includes sanctification through faith and evangelisation of the Gospel and Catholic social teaching, which emphasises support for the sick, the poor, and the afflicted through the corporal and spiritual works of mercy. The Catholic Church is the largest non-government provider of education and health care in the world.
The Catholic Church has influenced Western philosophy, culture, science, and art. The Catholic Church shared communion with the Eastern Orthodox Church until the East–West Schism in 1054, disputing particularly the authority of the Pope, as well as with the Oriental Orthodox churches prior to the Chalcedonian schism in 451 over differences in Christology. Catholics live all over the world through missions, diaspora, and conversions. Since the 20th century the majority reside in the southern hemisphere due to secularisation in Europe, and increased persecution in the Middle East.
Catholic (from Greek: καθολικός, translit. katholikos, lit. 'universal') was first used to describe the church in the early 2nd century. The first known use of the phrase "the catholic church" (καθολικὴ ἐκκλησία he katholike ekklesia) occurred in the letter written about 110 AD from Saint Ignatius of Antioch to the Smyrnaeans. In the Catechetical Lectures (c. 350) of Saint Cyril of Jerusalem, the name "Catholic Church" was used to distinguish it from other groups that also called themselves "the church". The "Catholic" notion was further stressed in the edict De fide Catolica issued 380 by Theodosius I, the last emperor to rule over both the eastern and the western halves of the Roman Empire, when establishing the state church of the Roman Empire.
Since the East–West Schism of 1054, the Eastern Church has taken the adjective "Orthodox" as its distinctive epithet (however, its official name continues to be the "Orthodox Catholic Church") and the Western Church in communion with the Holy See has similarly taken "Catholic", keeping that description also after the Protestant Reformation of the 16th century, when those who ceased to be in communion became known as "Protestants".
While the "Roman Church" has been used to describe the pope's Diocese of Rome since the Fall of the Western Roman Empire and into the Early Middle Ages (6th–10th century), the "Roman Catholic Church" has been applied to the whole church in English language since the Protestant Reformation in the late 16th century. "Roman Catholic" has occasionally appeared also in documents produced both by the Holy See, notably applied to certain national episcopal conferences, and local dioceses.