Hailstorm occurs in summer season due to the formation of clouds called?

Hailstorm occurs in summer season due to the formation of clouds called?

موسم گرما میں ژالہ باری بادلوں کے ۔۔۔۔۔ بننے کی وجہ سے ہوتی ہے؟
Explanation

Cumulonimbus is a dense, towering vertical cloud, typically forming from water vapor condensing in the lower troposphere.