The document provides an overview of the Indus Valley Civilization, one of the earliest civilizations in South Asia. It discusses the discovery of major sites like Harappa and Mohenjo-Daro in modern-day Pakistan. The civilization had highly advanced urban planning with grid systems and effective drainage. Residents practiced agriculture and traded regionally and internationally. The civilization declined around 1500 BCE for reasons that remain unclear such as natural disasters or invasion, but it demonstrated sophisticated cultural and technological achievements for its time.