Answer:
The Rosetta Stone was a tablet found in 1799 by French explorers in the city of Rashid, on the bank of the Nile River. This stone contained scriptures in the Egyptian and Greek languages, and, thanks to the comparison between both languages (since the language and Greek writing was already known) allowed the deciphering of hieroglyphic writing for the first time, which allowed a greater understanding of Egyptian culture and the decipherment of the other hieroglyphic writings previously found.