Nitrate film base was the first transparent flexible plasticized base commercially available, thanks to celluloid developments by John Carbutt, Hannibal Goodwin, and Eastman Kodak in the 1880s.
During 1934, Dainippon Celluloid Company, Japan's first cinematic film manufacturer, separated from its struggling photographic division. The new company was known as Fuji Photo Film Co., Ltd.
When cameras were analogue in nature, based upon the use of rolls of celluloid film, the process of photo printing was a long, complicated and expensive one.
He found celluloid (cellulose nitrate) of which flexible transparent foils could be made. Contemporary film makers had already used celluloid plates as replacement for glass plates. The foil got coated with gelatine film emulsion.
One year later, in 1889, Eastman patented a transparent roll film using celluloid (similar to an early form of organic vegetation-based plastic).
The film base is polyester, which has replaced glass and celluloid. Polyester is flexible but very dimensionally stable (menaing it doesn't expand or contract much with moisture and temperature changes).
to use both, digital for some things and film for another. For people just learning about photography and how film works the digital camera is often a great accessory to film in that it can be used to preview an idea before capturing it on celluloid.
I know that I do not get the same satisfaction out of having taken a good digital image (I use a decent digital camera at work) as I do out of holding up a slide where all of the elements have come together in one piece of celluloid.
 See also: Photograph, Photography, Camera, Film, Stand
  
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