A business jet, private jet, or bizjet is a jet aircraft designed for transporting small groups of people. Business jets may be adapted for other roles, such as the evacuation of casualties or express parcel deliveries, and some are used by public bodies, government officials, VIPs, or the armed forces. Private jets can be broken up into 8 basic categories: light jets, super-light jets, mid-size jets, super-mid-size jets, heavy jets, ultra-long-range jets, and executive airliners, also known as "bizliners". These categories are determined based on passenger capacity, the range, and the size of the aircraft.