Apocrypha are works, usually written, of unknown authorship or of doubtful origin.Biblical apocrypha is a set of texts included in the Latin Vulgate and Septuagint but not in the Hebrew Bible. While Catholic tradition considers the texts to be deuterocanonical, Protestants consider them apocryphal. Thus, Protestant bibles do not include the books within the Old Testament but have often included them in a separate section. Other non-canonical apocryphal texts are generally called pseudepigrapha, a term that means "false writings".
The word's origin is the Medieval Latin adjective apocryphus, "secret, or non-canonical", from the Greek adjective ἀπόκρυφος (apokryphos), "obscure", from the verb ἀποκρύπτειν (apokryptein), "to hide away".
Apocrypha is commonly applied in Christian religious contexts involving certain disagreements about biblical canonicity. Apocryphal writings are a class of documents rejected by some as being either pseudepigraphical and/or unworthy to be properly called Scripture, though, as with other writings, they may sometimes be referenced for support, such as the Book of Jasher. While writings that are now accepted by Christians as Scripture were recognized as being such by various believers early on, the establishment of a largely settled uniform canon was a process of centuries, and what the term "canon" (as well as "apocrypha") precisely meant also saw development. The canonical process took place with believers recognizing writings as being inspired by God from known or accepted origins, subsequently being followed by official affirmation of what had become largely established through the study and debate of the writings. The Roman Catholic church provided its first dogmatic definition of her entire canon in 1546, which put a stop to doubts and disagreements about the status of the Apocrypha, as well as certain other books, which had continued from the beginning of the NT church. The leader of the Protestant Reformation, Martin Luther, like the Catholic church father Jerome (and certain others), favored the Masoretic canon for the Old Testament, excluding apocryphal books in his non-binding canon as being worthy to properly be called Scripture, but included most of them in a separate section, as per Jerome. Luther did not include the deuterocanonical books in his Old Testament, terming them "Apocrypha, that are books which are not considered equal to the Holy Scriptures, but are useful and good to read."