DJI manufactures a range of products like flying cameras (ex. Inspire and Phantom series), flying platforms, flight controllers for multi rotors, accessories for helicopters, camera gimballs (aerial, handheld) and ground stations. These products are for industrial, professional and amateur use.
DJI became the consumer world leader in UAV (drone) sales thanks to their Phantom line.
For a detailed look at DJI the company, visit wikipedia here.
Official Website: DJI.com