The Harappa civilization was first discovered through archaeological excavations at Harappa in 1921. Also known as the Indus civilization, it was characterized by advanced urban planning with gridded streets, well-designed housing with rooms around central courtyards, effective drainage systems, and public baths like the Great Bath discovered at Mohenjo-Daro. The Harappans developed distinctive pottery, seals, and crafts and engaged in regional trade as evidenced by standardized weights and measures.