What did the cities of Mohenjo-Daro and Harappa achieve?

Mohenjo-Daro and Harappa, prominent cities of the Indus Valley Civilization, achieved remarkable urban planning and advanced architecture, characterized by grid layouts, sophisticated drainage systems, and standardized brick sizes. They facilitated trade and commerce through well-developed marketplaces and weights and measures. Additionally, their social organization and cultural practices, evidenced by artifacts and seals, indicate a complex society with a rich artistic heritage. Overall, these cities exemplified early urbanization and technological innovation in ancient history.