The Rosetta Stone is significant because it provided the key to deciphering Egyptian hieroglyphs, a writing system that had been a mystery for centuries. Discovered in 1799 by French soldiers during Napoleon's campaign in Egypt, it features the same text inscribed in three scripts: Greek, Demotic, and hieroglyphs. The stone served as a linguistic bridge, allowing scholars, especially Jean-François Champollion, to unpack the meanings of ancient Egyptian texts. This breakthrough not only unlocked a wealth of historical knowledge about Ancient Egypt but also enhanced our understanding of its culture, religion, and society.