Why do personal computers use peripheral devices such as printers and display screens?

Personal computers use peripheral devices such as printers and display screens to bridge the gap between digital processing and human interaction. These devices are classified as output peripherals, which serve the essential function of translating digitized signals—processed by the computer—into a form that is intelligible to a human operator.1

• Display Screens: These devices, such as video display terminals, transform computer-stored data into a visual format for human viewing. Whether utilizing cathode-ray tube (CRT) technology or modern liquid crystal displays (LCD), they allow users to interact with information through text, graphics, and video. Advanced displays further enhance this utility by enabling features like zooming, windowing, and touch-based command activation.23
• Printers: These devices provide a physical, permanent record of digital data. By converting electronic information into a tangible format—such as through laser printing or inkjet printing—printers allow users to extract and utilize processed information outside of the digital environment.31

In essence, these peripherals are necessary because they reverse the input process, converting binary code into formats that humans can read, see, or touch.1