Why did sumerians use cylinder seals?

Sumerians used cylinder seals primarily for marking ownership and authenticating documents, as well as for decoration and personal identification. These small, cylindrical objects were engraved with intricate designs and could be rolled over clay to leave a unique imprint, serving as a form of signature. They played a crucial role in trade, administration, and communication within Sumerian society, providing a means to secure transactions and convey information. Additionally, cylinder seals often depicted mythological or religious themes, reflecting the cultural and spiritual beliefs of the Sumerians.