What does each license entail? What are the specific differences between CPL, MPL and ATPL (unfrozen and frozen) for pilots?

Commercial Pilot Licence with Instrument Rating (CPL/IR) - The traditional ab-initio method of training pilots for the airlines. The CPL/IR are the bare necessities for anyone thinking of a career in the airlines. Trainees spend about 200 hours training on small general aviation aircraft. While in S