Pixel may refer to any of the following:

1. Term comes from the words PEL (picture element). A px (pixel) is the smallest part of an image that is displayed on computer, phone, table, TV, or any other electronic device that can show an image or capable of printing. You can get a better understanding of what a pixel is when zooming into an image and the image is distorted showing these small square boxes; you can see this in the image below.

As it is displayed in this example, the character in this picture is zoomed into at a very high percentage probably over a 1000%. Each blocks/ squares you can seen in this picture 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.