The long-form of OPC is Ordinary Portland Cement and the long-form of PPC is Portland Pozzolana Cement.
The Bureau of Indian Standard classification states that OPC is available in 33-Grade, 43-Grade, and 53-Grade. While PPC is available in one grade, its strength matches the strength of 33 Grade OPC after curing.
OPC is the most commonly used cement in construction. A higher grade like grade 53 is not recommended for plastering as it is known to develop shrinkage cracks due to its high strength.
PPC can be used in all types of construction works like RCC work in Residential, Commercial, and Industrial buildings, Marine work, Mass concrete work like Dam, Huge Foundations, Roads, runways, Bridges, Flyover, etc.