The New King James Version of the Bible differs from the original King James Version in that it uses more modern language than the original. The NKJV is not a new translation but an attempt to preserve and improve the original KJV, explains Thomas Nelson Bibles.
The Authorized Version of the Bible, commonly called the King James Version, was published in England in 1611. Produced and published by royal authority, it was the official version of the bible used in the Church of England. When the KJV celebrated its 400th anniversary in 2011, it was still the bestselling bible of all time, according to PBS.
Thomas Nelson Publishing released the New Testament in the New King James Version in 1979. The Psalms were published in 1980, and the entire Bible was released in 1982. The NKJV was an attempt to preserve the style and much of the vocabulary of the original KJV, while updating the language for the benefit of modern readers.
One example of difference between the NKJV and the original KJV is the latter's use of archaic personal pronouns. "Thou" and "thee" were the common second-person singular pronouns in the 17th century. The NKJV updated these pronouns to the modern "you." Archaic verb forms were also eliminated in the NKJV. While the original KJV featured verb forms such as "doth" and "lovest," the NKJV uses the modern "does" and "loves."