The Holy Qur-an is the last Divine Book sent by God for the guidance of mankind.

God revealed the Holy Qur-an to His last Messenger Muhammad (Peace be upon him) over a period of almost twenty-three years, through Angel Gabriel.
He received the first revelation in the year 609 CE, when he was meditating in a small cave of mount Hira near Makkah. These revelations continued after Muhammad (Peace be upon him) and his companions were forced to migrate to Madinah.

Muhammad (Peace be upon him) used to memorize the revealed verses of the Qur-an and used to recite them to his companions, most of whom used to memorize them immediately. Some of his companions used to write them down on available media like barks of trees, stone tablets, parchments, leather etc.
Designated writers also meticulously kept records of the revealed verses of the Qur-an. The existing arrangement of the verses of the Qur-an was done by Muhammad (Peace be upon him). 

The tradition to memorize the Qur-an continues and there are millions of Muslims around the world who have memorized it in its entirety.

The Qur-an carries three main themes: Oneness of God (Wahdah), Prophethood (Risalah) and an eternal Life after Death (Akhirah). Besides this, the Qur-an has a uniquely rich collection of truth, wisdom and guidance for a perfect way of living and creating a perfect society.