Liturgics
There are four different liturgies in the Orthodox Church: 
The Liturgy of St. John Chrysostom
The Liturgy of St. John Chrysostom is the most common liturgy celebrated on Sunday and weekends.
The Liturgy of St. Basil the Great
The Liturgy of St. Basil the Great is celebrated only ten times a year, mainly during the Sundays of Lent. St. Basil liturgy is very much like that of St. John Chrysostom with the exception of the prayers offered privately by the priest. These are much longer.
The Liturgy of St. James
The Liturgy of St. James, the Brother of the Lord is celebrated only once a year on the feast Day of St. James, October 23, And only in certain places such as Jerusalem.
The Liturgy of the Pre-Sanctified Gifts
The Liturgy of the Pre-Sanctified Gifts is used only on Wednesdays and Fridays of Lent and on the first three days of Holy Week. It is called pre-sanctified because no consecration takes place. The communion elements distributed are reserved from The Eucharist of the previous Sunday. Thus, the pre-sanctified is not a Eucharistic liturgy but rather an evening Vesper Service that includes the distribution of pre-consecrated elements of Holy Communion. Its purpose is to offer us more frequent opportunity during Lent to receive Holy Communion. It is used during Lent because the normal liturgy is an extremely joyful expression of the Resurrection and is considered to be inappropriate to the deeply penitential season of Lent.
“Introducing The Orthodox Church: its Faith and Life” by Anthony M. Coniaris
