The purpose of a computer monitor is to display text and graphics produced by computer programs and to provide a visual interface for computer users. Monitors look like television sets and attach to the main computer unit through a cable.
The computer monitor is an integral part of a computer system that allows computer users to extract information and provide input. Modern computer monitors use LCD technology to translate information from a computer's graphics card to a visual representation by modifying light as it passes through liquid crystals. Older CRT monitors produce images by firing electrons at phosphor dots on the screen. LCD monitors are much thinner than CRT monitors because they do not contain bulky cathode ray tubes for creating electron streams.