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Photography is a technique of producing permanent images on sensitized surfaces by means of the photochemical action of light or other forms of radiant energy. In today's society, photography plays important roles as an information medium, as a tool in science and technology, and as an art form, and it is also a popular hobby. It is essential at every level of business and industry, being used in advertising, documentation, photojournalism, and many other ways. …

…tures, was introduced in 1925 in Germany, and because of its compactness and economy, it became popular with both amateur and professional photographers. During this period, finely powdered magnesium was used by professional photographers as an artificial illuminant. Sprinkled in a trough and fired with a percussion cap, it produced a brilliant flash of light and a cloud of acrid smoke. In the 1930s the photographic flashbulb replaced magnesium powder as a light source.