Screen resolutions are expressed in pixels, for example 800 pixels (width) by 600 pixels (height). 800 x 600 is the smallest size web sites are designed for. Previously it was 600 x 480 and in the near future it will increase to 1024 x 768. This is due to the increase in the number of users with more affordable higher resolution monitors. The higher the resolution the more information that can be displayed on the screen.
