What role did archaeologists play in understanding Harappans?

Archaeologists have played a crucial role in understanding the Harappan civilization by excavating and studying the remains of their cities. Through careful digging, they discovered important artifacts like seals, pottery, and tools, which provide insight into the daily life and practices of the Harappans. Excavations of cities like Mohenjo-daro, Harappa, and Lothal revealed their advanced urban planning, trade systems, and craftsmanship. Archaeologists also uncovered evidence of their writing system and the materials used for construction. These findings help historians piece together the story of the Harappan civilization, despite the absence of written records in a language we can fully understand.

This question related to Chapter 6 Social Science Class 6th NCERT.
From the Chapter 6. The Beginnings of Indian Civilisation.
Give answer according to your understanding.