Business jet, private jet or, colloquially, bizjet is a term escribing a jet aircraft, usually of smaller size, designed for transporting groups of business people. Business jets may be adapted for other roles, such as the evacuation of casualties or express parcel deliveries, and a few may be used by public bodies, governments or the armed forces. The more formal terms of corporate jet, executive jet, VIP transport or business jet tend to be used by the firms that build, sell, buy and charter these aircraft.