The central Catholic act of worship is attending the Mass, or Divine Liturgy. The Mass is divided into two parts: the Liturgy of the Word, and the Liturgy of the Eucharist. 

During the first part, following the Prelude, the priest leads us in prayer and hymns/chants, praising God, thanking Him, and asking Him for forgiveness. We hear Scripture readings, the priest gives a homily, and then we all pronounce the core principles of our faith. 

In the second part, the priest says the blessing, transforming bread and wine into the Body and Blood of Christ. We all sing the "Our Father" prayer, and then receive communion. Finally, there is a closing prayer and final blessing followed by the Postlude.