Iconostasis translates into Icon Screen. Most Orthodox households have some sort of Iconostasis where the family places icons, incense, and other religious items. Iconostasis is also the name for the icons in front of the altar in an Orthodox Church.

Altar. (Hebr. "a place of sacrifice;" Gr. hieron; Sl. prestol). In Orthodox architecture the term signifies the area of the sanctuary divided from the rest of the church by the iconostasis.

By the icon screen (or iconostasis) which separates the main body of the church, the Nave (representing the people on earth) from the holy of holies, the Altar (representing heaven). The icon screen also has a curtain which represents the curtain that was in the Temple in Jerusalem.

Byzantine Catholics are very different from Romans. They even have their own rite. During Liturgy (as they call it) they focus more on Jesus' Resurrection as opposed to His Crucifixion. Byzantine churches are filled with incense and the priest wears special garments. In Byzantine churches, the iconostasis separates the altar from the congregation. An iconostasis is a wall of icons with three doors in it, one for the priest and two for altar servers. Confession is different too. Instead of confessing your sins through a screen door, you confess to the priest face-to-face in front of a large icon of Jesus while he holds his garments over you. Hopefully I shed some light on your question.

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Because it contains the Holy Bible, the Holy Relics and the Sacred Communion Cup where the blessed bread and wine are transformed into the Body and Blood of Jesus Christ during the Divine Liturgy. It also contains a miniature gold version of the Ark of the Covenant. The altar is the most sacred part of an Orthodox Church, in the same way that the 'Holy of Holies' was in the Temple in Jerusalem, before it was destroyed.