The Piper PA-28 Cherokee is a family of light aircraft designed for flight training, air taxi, and personal use. It is built by Piper Aircraft. All members of the PA-28 family are all-metal, unpressurized, single-engine, piston-powered airplanes with low-mounted wings and tricycle landing gear. They all have a single door on the co-pilot side, which is entered by stepping on the wing.
The first PA-28 received its type certificate from the FAA in 1960, and the series remains in production to this day. Current models are the Arrow and Archer TX. The Archer was discontinued in 2009, but with investment from new Piper owners Imprimis, was put back into production in 2010.
The PA-28 series competes with the Cessna 172, the Grumman American AA-5 series, and the Beechcraft Musketeer.
Piper has created variations within the Cherokee family by installing engines ranging from 140 to 300 hp (105-220 kW), providing turbocharging, offering fixed or retractable landing gear, fixed-pitch or constant speed propellers, and stretching the fuselage to accommodate 6 people. The larger, six-seat variant of the PA-28 is generally the PA-32; earlier versions were known as the "Cherokee Six," and a PA-32 version called the Saratoga was in production until 2009.
Source: Wikipedia, "Piper Cherokee", available under the CC-BY-SA License.