Orthodox Christianity is one of the oldest branches of Christianity, tracing its roots back to the early Christian communities established by the apostles. It is characterized by its adherence to the traditions and teachings of the early Church, emphasizing the importance of the sacraments, particularly the Eucharist, and the authority of the Ecumenical Councils. The Orthodox Church is composed of several autocephalous (independent) churches, each led by its own hierarchy. Major branches include the Greek Orthodox Church and the Russian Orthodox Church. Orthodox Christians celebrate their faith through rich liturgical practices and a deep sense of community, maintaining a strong connection to their historical and cultural heritage.