What the Quran is
The Quran (Arabic: al-Qur'an, "the recitation") is the central religious text of Islam. Muslims believe it to be the literal word of God (Allah), revealed to the Prophet Muhammad ﷺ through the angel Jibril (Gabriel). It is the primary source of Islamic belief, worship, law, and guidance. The Quran describes itself in its opening passages as a guide for the God-conscious:
"This is the Book about which there is no doubt, a guidance for those conscious of Allah."
— Quran 2:2 (Saheeh International)1
How it was revealed
Revelation began when the Prophet Muhammad ﷺ was about forty years old, while he was in seclusion in the cave of Hira near Mecca. In a narration from his wife Aisha, the angel came to him and commanded him to "Read" (Iqra), conveying the first verses of the Quran:
"Read in the name of your Lord who created — created man from a clinging substance. Read, and your Lord is the most Generous — who taught by the pen — taught man that which he knew not."
The Quran was then revealed gradually, in stages, over approximately 23 years — responding to events and questions as the young Muslim community grew.111213 The Quran itself explains that this gradual revelation was deliberate, to strengthen the Prophet's heart:
"...Thus [it is] that We may strengthen thereby your heart. And We have spaced it distinctly."
— Quran 25:32 (Saheeh International)3
The month in which revelation first came, Ramadan, holds special honor for this reason:
"The month of Ramadan [is that] in which was revealed the Quran, a guidance for the people and clear proofs of guidance and criterion."
— Quran 2:185 (Saheeh International)4
How it is structured
The Quran is made up of 114 chapters, called surahs, which vary greatly in length — from a few short lines to several pages. Each surah is composed of individual verses, called ayat.111213 The surahs are traditionally described as either Meccan or Medinan, depending on whether they were revealed before or after the Prophet's migration to Medina.
How it was preserved
Muslims hold that the Quran has been preserved unchanged since its revelation, and the Quran presents this preservation as a promise from God Himself:
"Indeed, it is We who sent down the Reminder [the Quran], and indeed, We will be its guardian."
— Quran 15:9 (Saheeh International)5
Preservation happened in two ways at once: through memorization — companions of the Prophet ﷺ committed the entire text to heart, a practice continued by millions of Muslims (huffaz) to this day — and through writing. After the Prophet's death, when many memorizers were killed in battle, the caliph Abu Bakr ordered the scattered written records gathered into a single volume, a task carried out by the scribe Zaid ibn Thabit:
Zaid ibn Thabit was tasked with collecting the Quran, gathering it "from palm stalks, thin white stones, and from the men who knew it by heart."
— Sahih al-Bukhari 49869
Later, as Islam spread to many lands, the caliph Uthman had this collection used to produce standardized copies, which were sent to the major regions so that everyone recited from one agreed text.1011
Its role and message
For Muslims, the Quran is not only a book to be read but to be recited and lived. Portions are recited in the five daily prayers, and its guidance shapes belief, worship, ethics, and law. The Quran also presents two challenges to those who doubt its divine origin. First, that no one can produce anything like it:
"Say, 'If mankind and the jinn gathered in order to produce the like of this Quran, they could not produce the like of it, even if they were to each other assistants.'"
— Quran 17:88 (Saheeh International)6
And second, that it is internally consistent — a sign, to Muslims, that it is not of human authorship:
"Then do they not reflect upon the Quran? If it had been from [any] other than Allah, they would have found within it much contradiction."
— Quran 4:82 (Saheeh International)7
In short
The Quran is, for Muslims, the literal word of God revealed to the Prophet Muhammad ﷺ over about 23 years, preserved unchanged in 114 surahs through both memorization and writing. It is the first and highest source of guidance in Islam — recited in worship and central to a Muslim's daily life.