How did the rosetta help decipher the hieroglyphics?

The Rosetta Stone was crucial in deciphering Egyptian hieroglyphics because it contained the same text written in three scripts: Greek, Demotic, and hieroglyphics. Scholars, particularly Jean-François Champollion, used the Greek text, which was already understood, as a reference to decode the hieroglyphic script. By comparing the symbols and their corresponding sounds and meanings across the three languages, they were able to unlock the complexities of ancient Egyptian writing, leading to significant advancements in Egyptology.