It is called reredos. It usually has iconography or painting depicting an episode of bible.
An altar screen is a partition separating the nave from the chancel in the church.
A Reredos.
Consecrated Hosts are stored in a locked Tabernacle, not on the altar. The Tabernacle may be located immediately behind the main altar or on its own pedestal in the Church, non on the altar.
An apse is a wing or recess in a church building that sticks out from the main building. It always has a semicircular end, and is usually situated at the end of the church behind the altar.
Altar.
An antependium is a screen in front of an altar, or an altar cloth.
A usually semicircular or polygonal, often vaulted recess, especially the termination of the sanctuary end of a church.
A priest was standing on the altar in the church.
The opposite of an altar might be a sacrificial table. Also, the altar is in the eastern portion of the church. The portion in the western part opposite to the altar in a church is called the entryway or vestibule.
It is a cloth placed on an altar.
In front!!
The chancel leads to the sanctuary and the altar.