The rites preceding the Liturgy of the Word, namely the Entrance, Greeting, Act of Penitence, Kyrie, Gloria, and collect, have the character of a beginning, introduction, and preparation. Their purpose is to ensure that the faithful who come together as one establish communion and dispose themselves to listen properly to God’s word and to celebrate the Eucharist worthily. In certain celebrations that are combined with Mass according to the norms of the liturgical books, the Introductory Rites are omitted or performed in a particular way.
TheoFonsAd fontes fidei