Eucharistic adoration is a practice in the Roman Catholic, Anglo-Catholic and some Lutheran traditions, in which the Blessed Sacrament is exposed and adored by the faithful.
Adoration is a sign of devotion to and worship of Jesus Christ, who is believed by Catholics to be present Body, Blood, Soul, and Divinity, under the appearance of the consecrated host, in the form of hosts, that is, consecrated altar bread. As a devotion, Eucharistic adoration, prayer, and meditation are more than merely looking at the Blessed Host, but are believed to be a continuation of what was celebrated in the Eucharist. From a theological perspective, the adoration is a form of latria, based on the tenet of the real presence of Christ in the Blessed Host.
Christian meditation performed in the presence of the Eucharist outside of Mass is called Eucharistic meditation. It has been practiced by such as Peter Julian Eymard, Jean Vianney and Thérèse of Lisieux. Authors such as the Venerable Concepcion Cabrera de Armida and Blessed Maria Candida of the Eucharist have produced large volumes of text based on their Eucharistic meditations.
When the exposure and adoration of the Eucharist is constant (twenty-four hours a day), it is called Perpetual adoration. In a monastery or convent, it is done by the resident monks or nuns and, in a parish, by volunteer parishioners since the 20th century. In the opening prayer of the Perpetual chapel in St. Peter Basilica, Pope John Paul II prayed for a perpetual adoration chapel in every parish in the world. Pope Benedict XVI instituted perpetual adoration for the laity in each of the five sectors of the diocese of Rome.