Not To Be Confused With
Catholics call these books “deuterocanonical” (a true but secondarily-recognized part of the canon); Protestants call the same books “apocrypha” and exclude them from Scripture.
These books were in the Greek Septuagint and are accepted as Scripture by Catholics and Orthodox (with some variation), while the Reformation returned to the Hebrew canon and set them apart. The difference is one strand of the authority debate.