A liturgy is like a script for a religious service, the official set of rules for performing a religious ceremony.
Liturgy has everything to do with the way people worship in public. In fact, this noun comes to us from the Greek word leitourgia, which means "public service, worship of the gods." In Christianity, The Liturgy is a specific service for the sacrament of the Eucharist. But every religion has their own form of liturgy or set way of performing certain worship rituals.