Why was the importance of the behistun inscription?

The Behistun Inscription, carved on a cliff in western Iran by King Darius I of Persia around 520 BCE, is crucial for several reasons. It serves as a key artifact in understanding the history of the Achaemenid Empire, detailing Darius's rise to power and his conquests. Additionally, the inscription is significant for its trilingual format (Old Persian, Elamite, and Babylonian), which helped scholars, notably Henry Rawlinson in the 19th century, to decipher cuneiform writing, unlocking vast amounts of ancient history and culture.