What is the Canon?

The word "canon" means "standard" or "rule."  It is the list of authoritative and inspired Scriptures.  Different religions have different canons. Most modern Protestants, and Protestant churches historically, accept exactly sixty-six books, thirty-nine books from Hebrew, which they call the Old Testament, and twenty-seven books written in Greek, which they call the New Testament. Protestants use and accept these books; therefore, there are sixty-six books in the Protestant canon.
Roman Catholics include fifteen more books or parts of books, and that is their canon; Greek Orthodox churches use most of these books, and these comprise their canon. The Jewish tradition is that of the Hebrew Bible only, of course, corresponding to the thirty-nine books of the Protestants. East Syrian Christians include fewer books than other Christians in the New Testament, while the Ethiopian churches use quite a few more books in both the Old Testament and New Testament.

The third American President, Thomas Jefferson, questioning the miracles of the New Testament while approving some of Jesus' moral sentiments, produced a thin volume which is called "The Jefferson Bible," edited literally with a razor and paste. In Islam, their inspired book is called the Quran (Koran).