What is the No. 1 best-selling book?

Among the most widely read and best-selling books of all time, The Bible stands as a towering achievement, with an estimated 5 billion copies sold worldwide. This holy text, revered by billions of people across various faiths, has had a profound impact on human history and culture.

Another highly influential work, the Quran, follows closely behind with approximately 3 billion copies sold. This Islamic scripture is considered the direct word of God by Muslims and plays a central role in their daily lives and beliefs.

With an impressive 900 million copies sold, The Little Red Book: Quotations from Chairman Mao holds a unique place in the annals of best-selling books. This compilation of Mao Zedong's speeches and writings has been instrumental in shaping China's political landscape and ideology.

Lastly, J.R.R. Tolkien's epic fantasy series The Lord of the Rings has sold a staggering 150 million copies. This trilogy, featuring the quest of the hobbit Frodo to destroy the One Ring, has captivated the imaginations of readers worldwide and inspired numerous adaptations, including the highly successful film series.

Don Quixote, Miguel de Cervantes' masterpiece, has sold over 500 million copies, making it one of the most popular and enduring works of literature. Its humorous portrayal of the eccentric knight Don Quixote and his faithful squire Sancho Panza has captivated readers for centuries.