The public worship of the Roman Catholic church is its liturgy, principally the Eucharist, which is also called the Mass. The two main parts of the Mass are the Liturgy of the Word and the Liturgy of the Eucharist. 

The Liturgy of the Word focuses on readings from the Bible and a homily, while the Liturgy of the Eucharist is the central part where the bread and wine are consecrated and distributed as Communion

The worship of the church is further expressed by the faithful through participation in the Sacraments of the Catholic Church. The Sacraments include the rites of Baptism, Holy Eucharist, Reconcilitation, Confirmation,  Matrimony, Holy Orders and Anointing of the Sick. 

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• Catholic belief is succinctly expressed in the profession of faith or credo called the Nicene Creed:
  
  I believe in one God, the Father almighty,
  maker of heaven and earth, of all things visible and invisible.

  I believe in one Lord Jesus Christ,
  the Only Begotten Son of God,
  born of the Father before all ages.

  God from God, Light from Light,
  true God from true God,
  begotten, not made,
  consubstantial with the Father;
  through him all things were made.

  For us men and for our salvation he came down from heaven,
  and by the Holy Spirit was incarnate of the Virgin Mary,
  and became man.

  For our sake he was crucified under Pontius Pilate,
  he suffered death and was buried,
  and rose again on the third day
  in accordance with the Scriptures.

  He ascended into heaven and is seated
  at the right hand of the Father.
  He will come again in glory
  to judge the living and the dead
  and his kingdom will have no end.

  I believe in the Holy Spirit, the Lord, the giver of life,
  who proceeds from the Father and the Son,
  who with the Father and the Son is adored and glorified,
  who has spoken through the prophets.

  I believe in one, holy, catholic and apostolic Church.
  I confess one baptism for the forgiveness of sins
  and I look forward to the resurrection of the dead
  and the life of the world to come. Amen.