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A dig­i­tal cam­era (or digi­cam) is a cam­era that encodes dig­i­tal images and videos dig­i­tal­ly and stores them for lat­er repro­duc­tion. Most cam­eras sold today are dig­i­tal, and dig­i­tal cam­eras are incor­po­rat­ed into many devices rang­ing from PDAs and mobile phones (called cam­era phones) to vehi­cles. Dig­i­tal and film cam­eras share an opti­cal sys­tem, typ­i­cal­ly using a lens with a vari­able diaphragm to focus light onto an image pick­up device. The diaphragm and shut­ter admit the cor­rect amount of light to the imager, just as with film but the image pick­up device is elec­tron­ic rather than chem­i­cal. How­ev­er, unlike film cam­eras, dig­i­tal cam­eras can dis­play images on a screen imme­di­ate­ly after being record­ed, and store and delete images from mem­o­ry. Many dig­i­tal cam­eras can also record mov­ing videos with sound. Some dig­i­tal cam­eras can crop and stitch pic­tures and per­form oth­er ele­men­tary image editing.