The Catechism in Questions & Answers

622. What is the role of “prayer” in the divine service?

Prayer is an indispensable component of the divine service.
In the divine service, the congregation unites in the prayers spoken by the officiant. These express adoration, thanksgiving, intercessions, and pleas. Before the forgiveness of sins, the congregation prays the Lord’s Prayer. After receiving Holy Communion, each believer brings thanks to God in a silent prayer.