The Sacrament of Holy Orders is one of the three Ceremonials that can be given only once. This is because Ordination is a way to share in the Priesthood of Christ.
The other two Ceremonials, Baptism and Confirmation, are also truly ways of sharing in this Priesthood.
Thus the ordained Bishop stands in a direct unbroken line from the Apostles. Good to know, right?
Ordained Bishops receive the Grace to sanctify others. They also have the authority to teach the Faithful and to bind their consciences. Only the Pope can approve Episcopal Ordinations.
A priest can administer the Sacrament of reconciliation, Holy Eucharist and Anointing of the Sick.
When a Priest absolves us from our sins, he does that in the name of Christ. But he also represents the Community in which we belong. Because when we sin, we sin against God and Neighbor!
During the Sacrifice of the Mass the Priest, together with all of us who are attending, in Christ's name and by His power, offers to God the perfect Victim, Christ Himself, to God.
“For whenever you eat this bread and drink this cup, you proclaim the Lord's death until he comes”-1 Cor 11-26.
Thus they can baptize, witness marriage, bring the viaticum to the dying and also preside at funerals. They proclaim the Gospel and can be the homilist at mass.
Now we can see why this beautiful Sacrament is so enriching for Our Catholic Religion. God took care of every aspect of our Spiritual Life. Holy be His Name, Amen.