Liturgy is the public worship of the Church. It includes all public services: Divine Service, Matins, Vespers, Funerals, Baptism, Holy Communion, etc.
Liturgy is action. Just like cooking. Cooking is not a list of ingredients for a recipe on a piece of paper. Cooking is an act. You do not cook until you are actively preparing, mixing, baking, grilling, roasting, etc. The same is for Liturgy. Paper with liturgy printed on it is not Liturgy. Liturgy is when you are actively doing it.
When people say they don’t get anything out of the Liturgy, the question is are you participating in it? Are you actively praying, singing, and responding? Do you understand what you are doing?
The Liturgy isn’t designed for entertainment. Instead, it is meant to draw you into the mystery of God. You need spiritual eyes to see. The Liturgy, like an onion, has layers. It has milk for the new born and meat for the mature believer.