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A Bit About Pixels
  pixel, named after a pix (like "pic" from picture) element, is the smallest unit on a display screen or monitor. Pictures are displayed on monitors by dividing the monitor up into rows and columns of pixels. The more pixels that are squeezed into a monitor's surface, the smoother an image on the screen will appear. Pixels are so close together that it appears that they are connected. A monitor with more pixels will be more expensive and will have more pixels per inch (PPI) than a cheaper monitor.

The number of bits used to display each pixel determines how many colors a pixel can display. In 8-bit color mode, a color monitor uses 8 bits per pixel which makes it possible to display 256 (or 2 to the 8th power) colors on-screen. Each pixel in a color monitor is made up of three dots; a red, a blue and a green (RGB). Optimally, the three dots are focused on the same spot which would create a very smooth image. The quality of a monitor depends on its resolution which is to say how many pixels it can display in a given area and how many bits are contained in each pixel.

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