Digital photography is a form of photography

Photography

Photography is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor or chemically by means of a light-sensitive material such as photographic film...

 that uses an array of light sensitive sensors to capture the image focused by the lens, as opposed to an exposure on light sensitive film. The captured image is then stored as a digital file ready for digital processing (colour correction, sizing, cropping, etc.), viewing or printing.

Until the advent of such technology, photographs were made by exposing light sensitive photographic film

Photographic film

Photographic film is a sheet of plastic coated with an emulsion containing light-sensitive silver halide salts with variable crystal sizes that determine the sensitivity, contrast and resolution of the film...

, and used chemical photographic processing

Photographic processing

Photographic processing is the chemical means by which photographic film and paper is treated after photographic exposure to produce a negative or positive image...

 to develop and stabilize the image.