What was citadel and how was it important for Harappans?

The cities like Mohen-jo-Daro and Harappa were divided into two parts. One was built on a raised platform called 'Citadel', while the other part was the main city where people lived and worked and was known as the lower part of the city. The citadel had public buildings, places of worship, workshops and granaries. In case of floods, people took shelter on the citadel.

The most important buildings on the citadel at Harappa were the granaries in which grains were stored and it held a lot of importance for the city dwellers during famines.

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Apart from this, there was a Great public bath at Mohen-jo-Daro, which was a bathing pool around 139 feet in length and 23 feet in breadth and nine feet deep. People bathed here on religious festivals.