Solution :
The seals were produced mainly for commercial purposes. The seals were used by traders. stamp their goods. was tied, a layer of wet clay was applied to the knot, and the seal was pressed on it leaving an imprresion.
Seals were used for facilitating long-distance communication. When a bag of goods was transported, its mouth was tied with a rope and wet clay with one or more seals being pressed to leave an impression. This ensured that the bag has not been meddled with.
The Harappan seals found in West Asia show that the Harappans traded with West Asian countries.