Screen resolution is the number if pixels which are displayed on your monitor. Normal resolutions are 640x480, 800x600, 1024x768 and so on. With the assumption that you are in the Windows camp... Right click on your desktop in an area where no icon resides, this will bring up a window, click on "properties", this brings up display properties. Under the tab labeled "settings" you will see a slider with resolutions which are available for your system.