Our Lord and Saviour, Jesus Christ, established His Church with a definitive structure. It is the duty of every Catholic to understand this hierarchy and how it helps Christ’s Church lead the faithful at both the local and overall level.
The most basic level of the Church is the local parish. This is where practising Catholics are baptised and confirmed, get married and have their funerals, attend weekly mass and receive the sacraments. Often the parish is named after Christ himself (Blessed Sacrament, Sacred Heart), the Virgin Mary (Our Lady of Mercy, Our Lady of Good Counsel), or a Saint.
After the parish, there is the diocese: an amalgamation of parishes controlled by a local Bishop. The Bishop of the diocese is seen as an authentic successor to the apostles and is not just an ambassador to the Pope. Following from the diocese is the archdiocese controlled by an Archbishop, and finally, the Catholic Church headed by Saint Peter’s successor, the Pope.
The order of precedence for the Catholic Church can be found here.