Concrete has been used for many wonderful things throughout history, for either architecture or for infrastructure work and more.
The term PCC stands for plain cement concrete. The mixture of cement, fine aggregate (sand) and coarse aggregate are generally called plain cement concrete (PCC). Before starting any R.C.Cor masonry work directly on the excavated soil, PCC is done to form a levelled surface and to avoid laying concrete on soil directly so as to avoid mixing/ with soil and also to prevent soil extracting water from PCC thereby weakening it.
Plain cement concrete can also be called only “cement concrete (CC)” or “binding concrete”. Some even call it “Mud Mat”.