The Nikon Corporation is a Japanese company. It's products include not only Cameras but also binoculars, microscopes, and measurement instruments. Founded in 1917 as Nihon (Nippon) Kōgaku Kōgyō the company was renamed Nikon Corporation in 1988. The name Nikon comes from a merging of Nippon Kōgaku ("Japan Optical") and imitation of Zeiss Ikon.
Nikon's Raw format is NEF. More information on Nikon can be found on the Nikon Website and Wikipedia