The term 'Greek ORTHODOX Church' refers to the Eastern ORTHODOX Christian Church, which is the second-largest Christian denomination in the world. It is an ancient form of Christianity that traces its roots back to the Byzantine Empire and the teachings of Jesus Christ. The Greek ORTHODOX Church is a branch of the Eastern ORTHODOX Church, and it is characterized by its liturgical tradition, its use of the Greek language, and its adherence to the Nicene Creed. It is also known for its emphasis on the veneration of saints and icons.