Around 3200 BC, the Sumerians developed cuneiform, the world's earliest known writing system, in the city of Uruk in southern Mesopotamia (modern Iraq). Initially used for economic record-keeping, these pictographs were impressed into clay tablets using reed styluses, creating the distinctive wedge-shaped marks. Over time, this system evolved from simple pictographic representation to a complex script that could express abstract concepts and phonetic values, enabling the creation of literature and detailed records that would document Mesopotamian civilization for over 3,000 years.