Display Screen
The display screen, commonly referred to as the monitor, is an essential external component of a computer system. Although it exists separately from the main unit, it plays a vital role in the overall computer experience. The monitor serves as the interface through which the output generated by the video card is visually presented. There are two primary types of monitors: the traditional CRT, reminiscent of older television sets, and the more modern LCD screens, known for their superior display quality and energy efficiency. Additionally, LED monitors have been introduced as an upgrade to LCD technology. Monitors can connect to computers via various types of cables, including HDMI and VGA.
Keyboard
The keyboard is another crucial external component of a computer, enabling users to interact with the machine effectively. Available in a variety of designs and types, all keyboards share the fundamental purpose of data input. Classified as an input device, the keyboard transmits data to the computer without receiving any output in return. Users can connect a keyboard to their computer using either a wired connection, typically through a USB or PS2 cable, or wirelessly via Bluetooth technology.
Mouse
The mouse is a vital input device that allows users to interact with windows, files, and other elements displayed on the screen. It operates through a cursor controlled by the user’s hand movements across a flat surface. Mice come in various sizes and shapes, designed to accommodate human hand ergonomics. Standard features include a left button, a right button, and a scroll wheel positioned between the two. Similar to keyboards, mice can connect to computers through either wired or wireless connections.
Other External Computer Devices
Below is a list of additional external devices that complement a computer setup:
- Printer
- Webcam
- Microphone
- External Hard Drive
- Scanner
- Speakers, which output sound generated by the computer