The characteristics of the Quran

From: http://www.whyquran.com/877/content/view/116/134/

The Quran has a number of unique characteristics, some of which are as follows:
1- It is the actual Word of Allah (God), not created but revealed for the benefit of all mankind. Allah says: [It is He Who sent down the Criterion to His servant, that it may be an admonition to all creatures] (Quran 25:1).
2- It is complete and comprehensive. The Almighty says: [Nothing have We omitted from the Book] (Quran 6: 38). In another place we read: [And We have sent down to thee the Book explaining all things] (Quran 16: 89).
3- It is a theoretical and a practical Book, not only moralizing but also specifically defining the permissible and the forbidden. The importance of understanding the message of the Quran is undeniable, but simply reciting it with the intention of seeking Allah's pleasure and reward is also an act of worship and meritorious in itself. Allah the Almighty says: [So take what the Prophet gives you, and refrain from what he prohibits you] (Quran 59: 7).
4- Allah has perfected His religion for all mankind with the revelation of this Book. He says: [This day have I perfected your religion for you, completed My favor upon you and have chosen for you Islam as your religion] (Quran 5:3).
5- It is Allah's eternal miracle revealed to Prophet Muhammad (peace and blessings be upon him) for all succeeding generations. In response to those who doubt the origin of the Quran, Allah the Almighty has challenged the most articulate Arabs to produce a whole book, ten chapters, or even one solitary chapter that can be remotely comparable to the Quran. But to this day, no one has succeeded in meeting the challenge of the Almighty. The Almighty says: [Or they may say: "He forged it." Say: "Bring you then ten chapters forged, like unto it and call (to your aid) whomsoever ye can other than Allah, if you speak the truth] (Quran 11:13).
6- It has been revealed to re-establish the sincere worship of Allah alone, without associating any partners with Him: [This is a Book with verses basic or fundamental (of established meaning), further explained in detail, from One Who is Wise and Well-Aware. (It teaches) that you should worship none but Allah] (Quran 11: 1-2). [And they have been commanded no more than this: to worship Allah, offering Him sincere devotion, being true in faith, to establish regular prayer and to give Zakat (support of the needy), and that is the religion Right and Straight] (Quran 98: 5).
7- It contains a complete code that provides for all areas of life, whether spiritual, intellectual, political, social, or economic. It is a code that has no boundaries of time, place or nation: [Verily this Quran doth guide to that which is most right] (Quran 17: 9).
8- Allah the Almighty has taken upon Himself the duty of preserving the Quran forever in its entirety, as He says: [We have without doubt sent down the Message, and We will assuredly guard it (from corruption)] (Quran 15: 9).
9- It has been preserved so well, both in memory and in writing that the Arabic text we have today is identical to the text that was revealed to the Prophet (peace and blessings be upon him). Not even a single letter has yielded to corruption during the passage of centuries, and so it will remain for ever, by the order of Allah.
Source:
http://www.quran.org.uk/ieb_quran_intro.htm