"Thus Spoke Zarathustra" is a philosophical novel written by German philosopher Friedrich Nietzsche, first published in 1883. The book is divided into four parts and tells the story of a fictional character named Zarathustra, who is on a journey to share his philosophy with the people.

The book is often considered Nietzsche's masterpiece and explores themes such as the death of God, the will to power, and the Übermensch (or superman). Through Zarathustra's journey, Nietzsche presents his ideas on morality, religion, and the nature of humanity.

The character of Zarathustra is inspired by the historical figure of Zarathustra, who founded the ancient Persian religion of Zoroastrianism. However, Nietzsche's Zarathustra is not a religious prophet but a philosopher who seeks to share his wisdom with humanity.

The style of "Thus Spoke Zarathustra" is highly poetic and symbolic, often using metaphorical language to express complex philosophical ideas. The book has been highly influential in modern philosophy, literature, and art, and its impact can be seen in the works of many later thinkers, such as Martin Heidegger and Jean-Paul Sartre.