Term that comes from the words Picture Element (PEL). A pixel (px) is the smallest portion of an image or display that a computer is capable of printing or displaying. You can get a better understanding of what a pixel is when zooming into an image as seen in the example to the right.
As you can see in this example, the character image in this picture has been zoomed into at 1600%. Each of the blocks seen in this example is a single pixel of this image. Everything on the computer display looks similar to this when zoomed in upon; the same is true with printed images, which are created by several little dots that are measured in DPI.
In the picture below is an example of a close up of pixels on an LCD screen. As can be seen in the picture, we've zoomed into the "he" part of the word "help" to give a better understanding of how the display works. With this display, each pixel is made up of a red, green, and blue (RGB) light that is increased or decreased in intensity to make up each of the colors you see on the screen.