Quran Kareem or Quran Majeed or Quran Azim is the holy book of Muslims which was transmitted by God Almighty to the beloved prophet of the end of time peace be upon him through Gabriel Amin peace be upon him with words and meanings in the Arabic language continuously for 23 years. It has been revealed for the guidance of all mankind. And this Qur'an is a great miracle which will bear witness to the representativeness and mission of the Messenger of Allah may God bless him and grant him peace until the Day of Resurrection. All disbelievers challenge the world whether it is a human being a devil or a demon to bring another book like this or to bring something like a surah. But they were humbled by this. The Almighty gave them challenges from time to time to make it clear that they cannot do this. In Surah Al-Israa he says:

Translation: (And say (O Prophet) if humans and demons gather together to bring the like of this Qur'an they will not be able to do it even if they help each other)
The revelation of the Holy Qur'an is called revelation. There has been no interference (decrease or increase) in the grace and protection of Allah in the Holy Quran till today. This is the first ancient book of the world which has remained safe from human hands and will be safe until the Day of Resurrection under the protection of God Almighty. There has been no change in the holy book which is printed in millions of copies every day in the world until today. The text of all these printed books is the same. The Qur'an is the only book which has millions of memorizers (those who have learned to memorize it) in the world. The Holy Quran mentions other divine books such as the Torah the Psalms and the Bible which were revealed to the previous prophets and messengers.