Photograph
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A photograph is an image created by light falling on a photosensitive surface, usually photographic film or an electronic image sensor, such as a CCD or a CMOS chip. Most photographs are now created using a smartphone or camera, which uses a lens to focus the scene's visible wavelengths of light into a reproduction of what the human eye would see. The process and practice of creating such images is called photography.
The earliest known surviving product of Nicéphore Niépce's heliography process, 1825. It is an ink on paper print and reproduces a 17th-century Flemish engraving showing a man leading a horse.
A modern-day photograph of an Icelandic landscape, captured on a personal camera
The Market Square of Helsinki, in the 1890s
Long-exposure photograph of the Very Large Telescope
Digital photography
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Digital photography uses cameras containing arrays of electronic photodetectors interfaced to an analog-to-digital converter (ADC) to produce images focused by a lens, as opposed to an exposure on photographic film. The digitized image is stored as a computer file ready for further digital processing, viewing, electronic publishing, or digital printing. It is a form of digital imaging based on gathering visible light.
The Mars Orbiter Camera selected by NASA in 1986 (costing US$44 million) contains a 32-bit radiation-hardened 10 MHz processor and 12 MB of DRAM, then considered state of the art.
Nikon D700 — a 12.1-megapixel full-frame DSLR
Canon PowerShot A95
First digital image ever created, by Russell Kirsch. It is an image of his son, Walden.