<p>A few corrections and add-ons: The IB is a program that goes beyond the classroom. You have to participate in CAS (Creativity, Action, Service) and write a (basically unsupervised) research paper yourself. It’s considered an extremely challenging course option.
The material taught in IB and AP, to the best of my understanding, overlaps, but is not exactly the same. The IB also has core requirements - you have to take a math class all four years, same with humanities, english, foreign language, etcetera.</p>