Why more megapixels are not mattered in a digital camera?

Today, most cameras produced are digital, and while there are still dedicated digital cameras, many more cameras are now being incorporated into mobile devices, portable touchscreen computers, which can, among many other purposes, use their cameras to initiate live video telephony and directly edit and upload imagery to others. And high-end, high-definition dedicated cameras are still commonly used by professionals.
Digital camera A digital camera or digicam is a camera that captures photographs in digital memory. Digital and movie 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.

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…

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