NRJ Design Glossary
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Pixel

The cell is nature's building block, and the pixel is the Web designer's. Pixel is one of those half-baked half-acronyms: PICture ELement. It refers to how monitors divide the display screen into thousands or millions of individual dots. A pixel is one of those dots. An 8-bit color monitor can display 256 pixels, while a 24-bit color monitor can display more than 16 million. If you design a Web graphic on a 24-bit monitor, there's an excellent chance that many of your 16 million pixels won't be seen by visitors to your site. Since the agreed-upon lowest common denominator palette for the Web has 216 colors, you should design your graphics using 8-bit color.
(see Bit Depth)

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