The altar, a sacred object used in Catholic worship, is typically a table of stone or wood. Its simple form belies its profound symbolic meaning. It represents Christ, the sacrificial Lamb, and the table of the Last Supper. The altar is used in liturgy; the Eucharist, the central act of Catholic worship, takes place upon it. The priest celebrates Mass at the altar, offering prayers and consecrating the bread and wine. Its presence signifies the sacred space where heaven and earth meet.