On laser printers, these dots are called dots. For printing presses, these dots are called lines. Pixels are not the same thing as the dots or lines of print and should not be confused. Think of your digital images as being made up of tiny squares of information like a checkerboard. These tiny squares are called pixels.
Pixels contain color, grayscale or black and white information about each tiny square of the image.
Resolution of digital or bitmapped images is the number of pixels per inch of the image. The goal is to have the correct number of pixels needed for the output. This will result in an appropriate file size and good picture quality. Computer monitors, projection equipment, and slide imaging cameras all have different pixel measurements. Computer monitors and projection equipment usually have a pixel resolution of 640w x 480h, 800w x 600h, 1024w x 768h, or more.