"The Divine Liturgy is the common action of Orthodox Christians officially gathered to constitute the Orthodox Church. It is the action of the Church assembled by God in order to be together in one community to worship, to pray, to sing, to hear God’s Word, to be instructed in God’s commandments, to offer itself with thanksgiving in Jesus Christ to God the Father, and to have the living experience of God’s eternal kingdom through communion with the same Christ Who is present in his people by the Holy Spirit." (OCA)
"The Matins service of the Church unites the elements of morning psalmody and prayer with meditation on the Biblical canticles, the Gospel reading, and the particular theme of the day in the given verses and hymns. The themes of God’s revelation and light are also always central to the morning service of the Church." (OCA)
"The Akathist Hymn is a profound, devotional poem, which sings the praises of the Holy Mother and Ever-Virgin Mary. It is one of the most beloved services in the Orthodox Church. It was composed in the imperial city of Constantinople, "the city of the Virgin," by Saint Romanos the Melodist, who reposed in the year 556."
The Vespers service of the Church is an evening service that marks the beginning of the Liturgical Day. "In the Orthodox Church the liturgical day begins in the evening with the setting of the sun.
This practice follows the Biblical account of creation: “And there was evening and there was morning, one day” (Gen 1.5)." (OCA)