Liturgy is the public official service of the Church which comes from the Greek leitourgia. So the Liturgy is the public official services, ceremonies, rites, scaraments and prayers of the Universal Church.

The most common use of the term liturgy today usaully is when referencing the chief official service only of the Sacrafice of the Holy Eucharist (in the Latin Rite this is what we call the Mass).

Liturgy is the public official services of the Church and not private devotions, spiritual life or private prayer life of each person.