Good question. Europe is way behind the United States in their thinking about deacons. Vac. 2 revived the ancient order of deacons. Read the Acts of the Apostles and about St. Stephen. For centuries, deacons were only transitional, that is, this was a step to the priesthood. Since Vat 2 the permanent diaconate has been revived. After much study and formation, men (Most of them married) are Ordained to the Permanent Diaconate. Their job is to serve as the deacons in the early church served the poor. Deacons go where the church is not: prisons, homeless shelters, hospitals,Etc. The deacon also serves in his parish. The deacon can help the priest with many duties. The deacon can baptise, witness the simple marrige ceremony, conduct wake and grave side services. The deacon can preach at Mass. The deacon does not say Mass, hear confessions, or annoint the sick. Some parishes have deacon administraters. The return of the diaconate was not to address the priest shortage, but in some cases it is being used this way. Hope this helps you.
God bless,
Deacon Tony