When it is necessary, announcements may be made. The celebrant then blesses the people assembled. Sometimes, the blessing is very simple. On special days, the blessing may be more extensive. In every case, the blessing always concludes "in the name of the Father, and of the Son, and of the Holy Spirit." It is in the triune God and in the sign of the cross that we find our blessing.
After the blessing, the deacon dismisses the people. In fact, the dismissal gives the liturgy its name. The word "Mass" comes from the Latin word, " Missa." At one time, the people were dismissed with the words " Ite, missa est," meaning "Go, you are sent. The word " Missa" comes from the word " missio," the root of the English word "mission." The liturgy does not simply come to an end. Those assembled are sent forth to bring the fruits of the Eucharist to the world.
From usccb.org
