A monitor is the main visual display of everything processed by a computer. Also known as VDU or visual display unit, it consists of a flat panel that displays the information from internal circuits that convert electrical signals into images and video output. Monitors have a variety of features that affect image quality, performance and power consumption.

Monitors are available in a wide range of sizes and configurations, from small portable desktop units to large production monitors. They can be rack-mounted or sit on a desktop with the use of monitor stands and mounts that provide tilt, swivel, pull-out, or articulating options.

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Display resolution and size are key factors in determining the quality of a monitor. Often described as dots per inch or DPI, higher numbers translate to sharper images and finer text. For gaming, the refresh rate (measured in hertz or Hz) determines how many times the screen updates each second to display new content, and can improve playability by reducing motion blur and lag.

Color in monitors is a complex topic, with multiple metrics used to evaluate a screen’s quality. Luminance, for example

e, is a common specification that refers to the amount of light emitted from the screen, measured in candelas per square meter (cd/m2).

Other important specifications include response time and input latency, which affect how quickly a monitor can process signal data and update its display. Input lag measures the delay between an electronic signal entering a monitor and appearing on its screen, with lower numbers indicating less latency.