The Apocrypha is a collection of Jewish writings composed between roughly 200 BC and 100 AD (including books such as Tobit, Judith, Wisdom, Sirach, Baruch, and 1-2 Maccabees) that are included in the Roman Catholic and Eastern Orthodox Old Testaments but not in the Jewish or Protestant Old Testament.
The original 1611 King James Bible printed the Apocrypha between the Old and New Testaments; most later Protestant editions of the KJV do not include it.