Muslims believe the Quran was verbally revealed by God to Muhammad through the angel Gabriel (Jibril), gradually over a period of approximately 23 years, beginning on 22 December 609 CE, when Muhammad was 40, and concluding in 632, the year of his death. Muslims regard the Quran as the most important miracle of Muhammad, a proof of his prophethood, and the culmination of a series of divine messages that started with the messages revealed to Adam and ended with Muhammad. The word "Quran" occurs some 70 times in the text of the Quran, although different names and words are also said to be references to the Quran. 

According to the traditional narrative, several companions of Muhammad served as scribes and were responsible for writing down the revelations. Shortly after Muhammad's death, the Quran was compiled by his companions who wrote down and memorized parts of it. These codices had differences that motivated the Caliph Uthman to establish a standard version now known as Uthman's codex, which is generally considered the archetype of the Quran known today. There are, however, variant readings, with mostly minor differences in meaning.
What is the name of the book?
How long did it take to complete?
Who transcribed it?
Who gave the message?
Who spoke to him?
Through whom?
When did Muhammad die?
About how old was he?
Who established a correct type of the book?
What is the book regarded as?
the Quran
 the text of the Quran
approximately 23 years
over a period of approximately 23 years
several companions of Muhammad
 several companions of Muhammad served as scribes
Muhammad
ended with Muhammad
God
by God to Muhammad
the angel Gabriel (Jibril)
through the angel Gabriel (Jibril)
632
in 632, the year of his death
63
609 CE, when Muhammad was 40, and concluding in 632, the year of his death
Caliph Uthman
Caliph Uthman to establish a standard version now known as Uthman's codex
Uthman's codex
 standard version now known as Uthman's codex