wrong Catholics believe in Transubstantiation.
Transubstantiation (Latin: transsubstantiatio; Greek: μετουσίωσις metousiosis) is, according to the teachings of the Roman Catholic Church, the change of substance or essence by which the bread and wine offered in the sacrifice of the sacrament of the Eucharist during the Mass, become, in reality, the body and blood of Jesus Christ.
The Roman Catholic Church teaches that in the Eucharistic offering bread and wine are changed into the body and blood of Christ.[1] The reaffirmation of this doctrine was expressed, using the word "transubstantiate", by the Fourth Council of the Lateran in 1215.[2][3] It was later challenged by various 14th century reformers—John Wycliffe in particular.[4]