Spin AWARENESS and AVOIDANCE is the only thing required for a PPL in the US anymore, mostly due to the lack of affordable and capable aircraft available for spin training. Since most aircraft are not easy to spin, we mostly concentrate on avoiding them altogether. For the CFI license, you are required to be able to teach, demonstrate, and recover from spins - hence why I was doing them today. What you receive at the end is an endorsement, just like a high-performance or tailwheel endorsement, to be able to perform them... As far as I know (I have to double check the FARs) we also do not need a specific rating for performing aerobatics, save for an authorization to be able to perform in front of a crowd.