What kind of written language did the sumerians use?

The Sumerians used cuneiform, which is a system of writing that uses wedge-shaped marks on clay tablets. Cuneiform was developed by the Sumerians in around 3500 BC and was used for over 3000 years in the Middle East. It was the first system of writing to use a stylus to write on a clay tablet, and it allowed the Sumerians to record their history, laws, and literature. Cuneiform was eventually adopted by other civilizations in the Middle East, including the Babylonians and the Assyrians.