This document provides an overview of essential elements of Catholic liturgy and worship. It discusses the key parts of the Catholic Mass including proclamation of scripture, consecration of bread and wine into the body and blood of Christ, and Holy Communion. It also contrasts differences between Eastern and Western church traditions, noting the Eastern church emphasized sensory experiences while the Western church focused on the altar and priest's actions. Finally, it reviews the spread of Catholicism worldwide and establishment of different Catholic rites that all remain united under the Pope.