According to the understanding of the Second Vatican Council (Sacrosanctum Concilium n. 41), the cathedral is the primary place where the People of God of a particular Church (diocese) gather under the leadership of the bishop, most especially in the celebration of the liturgy; it is in the cathedral that the unity and order of the particular Church are expressed, and it is from the cathedra that the local bishop carries out his ministry of "teaching, sanctifying and governing" his diocese.
In the canon law of the Roman Catholic Church, the cathedral therefore has a special legal status as a church. A solemn consecration is prescribed (can. 1217 CIC, can. 871 CCEO). The bishop usually takes possession of his diocese in the cathedral (enthronement), and his papal instrument of appointment must be read there (can. 382 CIC). It is also designated as the place for the funeral celebration of the bishop (can. 1011 CIC). The bishop is required to celebrate Mass frequently in the cathedral, especially on feast days and other solemn occasions (can. 389 CIC), and to administer the sacrament of Holy Orders there (can. 1011 §1 CIC). The Eucharist must be kept in a cathedral (can. 934 §1 CIC).
The canon law of the Eastern Catholic Churches requires the bishop to see to it that at least parts of the divine services are celebrated in the cathedral even daily according to the regulations of the respective rite church (can. 199 §2 CCEO) and that he himself presides over the celebration in the cathedral or in another church regularly and especially on feast days and other feasts of great popular interest (can. 199 §3 CCEO).
In the Roman Catholic Church, there are 3015 cathedrals worldwide, as well as 296 con-cathedrals, 423 former cathedrals and 41 pro-cathedrals, according to GCatholic.org's listing.
The highest-ranking church of the Roman Catholic Church is the Lateran Basilica, the cathedral of the diocese of Rome and the bishop's seat of the Pope. It bears the honorary title of Mother and Head of all the churches of the world. The consecration day of the Lateran Basilica is celebrated in the Roman Catholic Church as a feast in the rank of a feast of the Lord.