The central eucharistic service of the Orthodox Church
In Orthodox usage, the Divine Liturgy is the gathered Church offering praise, thanksgiving, prayer, the hearing of Scripture, and Holy Communion.
It is not presented as a private devotion but as the common eucharistic act of the Church assembled before God.
This is the ordinary Divine Liturgy used through most of the Orthodox church year.
At the cathedral it is normally the service meant when the public schedule says Divine Liturgy, unless a different liturgy is explicitly named.
The Liturgy of Saint Basil the Great is served on a limited number of appointed days, especially in Great Lent and at several great feasts.
Its prayers are fuller and more expansive, while the structure remains recognizably the same eucharistic offering of the Church.