An RCC pile foundation is a type of deep foundation where piles are made from Reinforced Cement Concrete (RCC). These piles are used to transfer the load of a structure to deeper, more stable soil layers or rock. RCC piles are reinforced with steel bars to enhance their strength and load-bearing capacity. They are typically used in situations where surface soil conditions are inadequate for supporting structures, such as in areas with weak or compressible soil.