"Homo Deus: A Brief History of Tomorrow" is a book by historian Yuval Noah Harari that explores the future of humanity. It examines how advancements in technology, biology, and artificial intelligence may shape our lives, potentially leading to a new era where humans transcend their biological limitations. The book discusses the concept of Homo Deus, or "God-man," suggesting that future humans may seek to achieve immortality, happiness, and divinity through scientific progress. Harari raises ethical questions about the implications of these developments, including the potential for inequality and the loss of meaning in life as we know it.