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pixel

Definition:

A pixel describes the quality of a digital picture or camera. A pixel is the smallest dot that makes up a picture. The more pixels, or megapixels, that make up a picture, the better the quality of the picture.

Here's a word you may not know...

digital picture

Digital pictures are photographs stored as a file, usually in JPEG format. Digital pictures can be produced from any type of digital photo source such as a digital camera.