Becoming a pilot requires various certifications. The most prominent licenses are the PPL, the CPL, the ATPL, and the Multi-Crew Pilot License (MPL). The International Civil Aviation Organization adopted the MPL certification in 2006 as a provision of Annex 1, Personnel Licensing. The MPL is very different from the CPL and PPL licenses.
According to ICAO, the license enables holders to perform the duties of a co-pilot on a multi-crew aircraft. ICAO mandates that all contracting states identify the license even though their respective aviation authorities do not issue the certification in their jurisdictions.