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Gypsum is used in cement because it acts as a set retarder, meaning that it slows down the setting time of concrete and allows it to remain workable for longer periods of time.
This improves its workability and helps to reduce cracking and other shrinkage issues associated with rapid drying. Additionally, gypsum helps to control the rate of hydration of the cement and can reduce the amount of bleeding and segregation of mix components, which can lead to a weaker material.