church, from the Latin ecclesia, it's a christian temple, is the place of preaching the teachings of Christ, obeying the principles of Christian ethics.
Church is the group of faithful united by the same faith and who celebrate the same religious doctrines.
In sociology Church is an organized and institutionalized religious group. It is a society whose members equally represent the sacred world and its relationship with the profane world. As a group, a church comprises a community of believers and usually a body of priests, hierarchical or not. As an institution, the church represents a system of dogmaic precepts, rites and beliefs.
Catholic church
Catholic Church or Roman Catholic Church, is a Christian Church, which aims to preach the Gospel of Jesus Christ. The structure of the Church was formed by the Bible, teachings and Christian doctrine. Through a dynamic interaction between the Bible and tradition, the Church developed its teachings, beliefs and creeds, in addition to the liturgy, sacraments and festivities, granting the faithful the essence of faith Christian.
Two rites or sacraments were instituted by Jesus himself: baptism and the Eucharist. Other rites include confirmation, marriage, ordination to the priesthood, confession, and extreme unction. Catholic clergy are male and celibate. It is made up of the ecclesiastical class of priests, with the pope being the supreme head of the entire Church and Vatican State, in addition to cardinals, bishops and priests. The Catholic Church has its sanctuary where the altar is located, in addition to offering places for community devotion.
orthodox church
Most Orthodox churches derive from the ancient Greek Christianity of the Eastern Mediterranean. The direct link with the Churches founded by the apostles and the memory of the Christian Roman Empire (the Byzantine Empire), which lasted until 1453, increase the importance of tradition as a guide for the Church. This tradition includes the scriptures, the ancient councils and the writings of priests, the liturgy, and the veneration of sacred images. The Orthodox Church does not recognize the pope as an authority. The Ecumenical Patriarch of Constantinople is the highest authority in the Orthodox Church, the Russian being the highest. Each autonomous church has its own patriarch, being self-governing. In addition to Russia, Orthodox Christianity is also important in Ukraine, Greece, Romania, Bulgaria, Serbia among others.