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Analog cameras use a roll of film which first must be processed and then all photos is printed out on special paper and delivered to the photographer. In digital cameras this roll of film has been exchanged with an light sensitive sensor (CCD or CMOS). Photos are then stored on memory cards which can then be transfered into a computer or any other device which have the software to show the photos.
The introduction of the digital film made photography alot cheaper and also faster.