The Qur'an ("Qur-Ann") is a Message from Allaah to humanity. It was transmitted to us in a chain starting from the Almighty Himself (swt) to the angel Gabriel to the Prophet Muhammad (pbuh). This message was given to the Prophet (pbuh) in pieces over a period spanning approximately 23 years (610 CE to 622 CE). The Prophet (pbuh) 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 (commands, sayings and actions) of the Prophet (pbuh). 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 Allaah, whereas the Sunnah was inspired by Allaah 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 Allaah.
Prophet Muhammad (pbuh) was the final Messenger of Allaah to humanity, and therefore the Qur'an is the last Message which Allaah 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 Its predecessors such as the Torah, Psalms, and Gospels have all been superceded.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 Islaam to investigate it and evaluate it for themselves. Allaah 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 (pbuh).
On this Web site there is a translation of the Qur'an into English. Note that any translation of the Qur'an immediately ceases to be the literal word of Allaah, and hence cannot be equated with the Qur'an in its original Arabic form. In fact a translation of the Qur'an is an interpretation which has been translated.