2.  The daguerreotype was the first commercially successful photographic process, invented
around 1837 by Louis-Jacques-Mandé Daguerre. The physical daguerreotype itself is a direct
positive made in the camera on a silvered copper plate. The raw material for plates was called
Sheffield plate, plating by fusion or cold-rolled cladding and was a standard hardware item
produced by heating and rolling silver foil in contact with a copper support. The surface of a
daguerreotype is like a mirror, with the image made directly on the silvered surface it is very
fragile and can be rubbed off with a finger, and the finished plate has to be angled so as to
reflect some dark surface in order to view the image properly. Depending on the angle viewed
and the colour of the surface reflected into it, the image can change from a positive to a negative.
The daguerreotype was the dominant photographic process until the 1850s when other processes
such as the collodion process and tintype replaced it.

3. Polaroid Corporation, a multinational consumer electronics, and former instant camera
and film maker Instant camera, sometimes known as a "Polaroid" camera, after the
company that invented the concept. Instant film photographs are sometimes known as
"Polaroids", after the company that invented and originally sold film to make them.
Polaroid, a type of synthetic plastic sheet used to polarize light, developed by Polaroid
Corporation. Polaroid Eyewear with glare-reducing polarized lenses made from Polaroid's
polarizer. Polaroid (album), a bootleg album by American band Phantom Planet. Poloroid,
a former stage name of singer-songwriter Danielle "Dan" Rowe.

4. Digital photography uses an array of electronic photo detectors to capture the image focused by
the lens, as opposed to an exposure on photographic film. The captured image is then digitized
and stored as a computer file ready for digital processing, viewing, digital publishing or printing.
Until the advent of such technology, photographs were made by exposing light sensitive
photographic film, and used chemical photographic processing to develop and stabilize the
image. By contrast, digital photographs can be displayed, printed, stored, manipulated,
transmitted, and archived using digital and computer techniques, without chemical processing.
Digital photography is one of several forms of digital imaging. Digital images are also created by
non-photographic equipment such as computer tomography scanners and radio telescopes.
Digital images can also be made by scanning other photographic images.