Ordination (or Holy Orders) is the Sacrament for those who have been called to a special ministry of service in the Church.
Three Degrees of Holy Orders
The deacon (Greek: diakonos) is the ordinary minister of Baptism and may lead wedding and funeral services. The deacon also preaches at Mass and attends to the pastoral care of the people.
In addition to the faculties and duties of the deacon, a priest (Greek: presbuteros) may celebrate the Mass, hear Confession, and anoint the sick. If delegated by his bishop, the priest may also confer Confirmation.
The bishop (Greek: episkopos) is a successor of the apostles and possesses the fullness of the Sacrament of Holy Orders. He therefore has the faculty to celebrate all Seven Sacraments. The duties most unique to him are to ordain priests and deacons, as well as to confer Confirmation as the apostle in the diocese.