CCC 1378
Catechism of the Catholic Church
Online Catechist: Bro. Emil
CCC 1378
Worship of the Eucharist. In the liturgy of the Mass we express our faith in the real presence of Christ under the species of bread and wine by, among other ways, genuflecting or bowing deeply as a sign of adoration of the Lord. "The Catholic Church has always offered and still offers to the sacrament of the Eucharist the cult of adoration, not only during Mass, but also outside of it, reserving the consecrated hosts with the utmost care, exposing them to the solemn veneration of the faithful, and carrying them in procession.
GIRM 275
Sources:
[1] Catechism of the Catholic Church
[2] General Instruction of the Roman Missal
Images:
[1] Hugot Seminarista
[2] tmblr