No, but the altar top should be stone of some sort, and a permanent altar should be unmovable.
It is the table at the front of the church, usually made of wood or marble. It is where the Eucharist is celebrated.
It is a cloth placed on an altar.
Originally, all Catholic Churches had an altar rail, which was a horizontal bar of wood, marble, or metal, supported by vertical posts the separated the sanctuary from the body of the Church. The altar rail also served as a Communion rail when the Eucharist was given to kneeling communicants. The gate was for the ministers to pass through on their way to and from the sanctuary.
Roman Catholic AnswerThe altar (and the priest when he is at the altar) are contained in the sanctuary of the Church.
.Catholic AnswerNormally stone, at least the actual part of the altar that the sacrifice is celebrated on would be stone. There is often an "altar stone" inserted in the top of a wooden altar.
An altar bell is a bell rung in the Roman Catholic church at significant times during the Mass.
An altar wine is a particular variety of wine produced for consumption during the Roman Catholic Mass.
.Catholic AnswerLinen clothes used at the altar.
the Sanctuary
Bowing to the altar, consecrated by a Bishop, acknowledges that Jesus is made present there; if a non Catholic attends the service he can bow as a sign of respect but does not have to if uncomfortable.
It is customary to reverence the altar (which means while facing the altar, stand "at attention", and then make a slight bow of the head) when a Catholic visiting the inside of a Catholic church passes an altar where Holy Mass has been celebrated, but where the Blessed Sacrament is not presently reserved. (When passing an altar or a tabernacle where the Blessed Sacrament is reserved, Catholics customarily genuflect instead.)
Altar servers.