The Qur'an ("Qor-Ann") is a Message from Allah to humanity. It was transmitted to us in a chain starting from the Almighty Himself (swt) to the angel Gabriel to the Prophet Muhammad (saas). This message was given to the Prophet (saas) in pieces over a period spanning approximately 23 years (610 CE to 622 CE). The Prophet (saas) was 40 years old when the Qur'an began to be revealed to him, and he was 63 when the revelation was completed. The language of the original message was Arabic, but it has been translated into many other languages.

The Qur'an is one leg of two which form the basis of Islam. The second leg is the Sunnah of the Prophet (saas). What makes the Qur'an different from the Sunnah is primarily its form. Unlike the Sunnah, the Qur'an is quite literally the Word of Allah, whereas the Sunnah was inspired by Allah but the wording and actions are the Prophet's. The Qur'an has not been expressed using any human's words. Its wording is letter for letter fixed by no one but Allah.

Prophet Muhammad (saas) was the final Messenger of Allah to humanity, and therefore the Qur'an is the last Message which Allah has sent to us. Its predecessors such as the Torah, Psalms, and Gospels have all been superceded. It is an obligation - and blessing - for all who hear of the Qur'an and Islam to investigate it and evaluate it for themselves. Allah has guaranteed that He will protect the Qur'an from human tampering, and today's readers can find exact copies of it all over the world. The Qur'an of today is the same as the Qur'an revealed to Muhammad (saas).

The Qur'an consists of 114 surahs (chapters) with a total of 6236 ayat (verses).

Each surah, or chapter, is generally known by an Arabic name derived from that surah (see List of surah names). The surahs are not arranged in chronological order (in the order in which Islamic scholars believe they were revealed) but in a different order, roughly descending by size.

In addition to and largely independent of the division into surahs, there are various ways of dividing the Qur'an into parts of approximately equal length for convenience in reading, recitation and memorization. The seven manazil (stations) and the thirty ajza' (parts) can be used to work through the entire Qur’an in a week or a month, one manzil or one juz' a day, respectively. A juz' is sometimes further divided into two ahzab (groups), and each hizb is in turn subdivided into four quarters. A different structure is provided by the ruku'at, semantical units resembling paragraphs and comprising roughly ten ayat each.

A hafiz is one who has memorized the entire text of the Qur'an, and is able to recite it properly (Tajweed). There are believed to be millions of these worldwide.[citation needed] All Muslims must memorize at least some parts of the Qu'ran, in order to perform their daily prayers.