What did Jean-Francois Champollion discover about hieroglyphs?

Jean-François Champollion is best known for deciphering Egyptian hieroglyphs, unlocking the language of ancient Egypt. In 1822, he announced that he had understood the script, particularly through his analysis of the Rosetta Stone, which featured the same text in Greek, Demotic, and hieroglyphs. Champollion's work demonstrated that hieroglyphs were not only pictorial symbols but also included phonetic components, enabling the translation of numerous ancient texts and significantly advancing the field of Egyptology.