what is the difference between priest and bishop
Hierarchy of the Catholic Church All clergy, including deacons, priests, and bishops, may preach, teach, baptize, witness marriages, and conduct funeral liturgies.[10] Only priests and bishops can celebrate the sacraments of the Eucharist (though others may be ministers of Holy Communion),[11] Penance (Reconciliation, Confession), Confirmation (priests may administer this sacrament with prior ecclesiastical approval), and Anointing of the Sick.[12][13] Only bishops can administer the sacrament of Holy Orders, by which men are ordained as bishops, priests or deacons.[14]
Cardinal (Catholic Church) A cardinal (Latin: Sanctae Romanae Ecclesiae cardinalis, literally Cardinal of the Holy Roman Church) is a senior ecclesiastical leader, considered a Prince of the Church, and usually (now always for those created when still within the voting age-range) an ordained bishop of the Roman Catholic Church. The cardinals of the Church are collectively known as the College of Cardinals. The duties of the cardinals include attending the meetings of the College and making themselves available individually or in groups to the Pope as requested. Most have additional duties, such as leading a diocese or archdiocese or managing a department of the Roman Curia. A cardinal's primary duty is electing the bishop of Rome when the see becomes vacant. During the sede vacante (the period between a pope's death or resignation and the election of his successor), the day-to-day governance of the Holy See is in the hands of the College of Cardinals. The right to enter the conclave of cardinals where the pope is elected is limited to those who have not reached the age of 80 years by the day the vacancy occurs.