In the Catholic Church, there are two different types of deacons. The most common type of deacon is the transitional deacon, who is typically a man on the way to the priesthood.
The second type of deacon, becoming increasingly more common, is the permanent deacon, meaning that the deacon will not become a priest and will remain a deacon for the rest of his life.
Deacons have been around since the early Church and are even referenced in the Acts of the Apostles.
The USCCB provides a succinct definition of a deacon and his particular role in the Church.
Deacons are called by God to serve in the Church, and this type of service is not open to everyone.
Here are the basic requirements to become a permanent deacon in the Catholic Church, though these can be altered by a local diocese.
Above all, becoming a permanent deacon is a particular vocation, a "call from God," and can not be seen as a job or career, but a mode of service within the Church.