Deep Thought is a fictional supercomputer from Douglas Adams' science fiction series, "The Hitchhiker's Guide to the Galaxy." Designed to calculate the Answer to the Ultimate Question of Life, the Universe, and Everything, it famously concludes that the answer is simply the number 42. This humorous twist highlights the absurdity of seeking a straightforward answer to complex questions. After revealing the answer, Deep Thought explains that the Ultimate Question itself is unknown. To find it, the computer suggests building an even more powerful computer, which leads to the creation of Earth. This clever narrative showcases the interplay between technology, philosophy, and humor in Adams' work.