A Moleben is a short service in which you pray for someone who is alive.
Troparion and Kondakions are basically short hymns that summarize the feast celebrated the day they're sung.
An akathist (this word comes from a greek verb that means "not to seat") is a prayer or an hymn that you sing while standing. The most famous one is the one to the Mother of God.
What do we mean by Mother of God ? We refer to the Virgin Mary.
Since Jesus-Christ is fully human and fully God, and that his human nature and his Divine nature are perfectly united in one person, we call his Mother the Mother of God. To deny her such a title would challenge the perfect unity of Jesus Christ's person, thus compromizing our salvation, since we believe that our salvation comes from the fact that Jesus-Christ (who is God)fully embraced our human nature.
However, this title does not mean that she was not a creature. She was human and created by God, just like all of us.
I hope this helps.
