Beyond the Private Pilot License and Instrument Rating exist many advanced levels of pilot certificates and ratings.  These include Commercial, Flight Instructor, Airline Transport Pilot, and Multi-Engine.  In addition, there are many specialties that may be sought. With each of these certificates, ratings, and speclialties--or any combination thereof--a pilot can branch off to any flight avenue imaginable.  Each level, with the exception of the multi-engine rating and the specialties, requires the pilot to pass both an FAA Written Exam and an FAA Practical Exam.