This document introduces basic computer components, focusing on monitors, keyboards, and input/output devices. It highlights differences between CRT, LCD, LED, and OLED monitors, and describes the various types of keyboards and scanning devices. Additionally, it mentions printers, including dot matrix printers and their printing methods.

1. Computer Basic Introduction
For beginners only
By Er. Ajay

2. Both are monitors
CRT Monitor
LCD / LED Monitor
LCD = Liquid Crystal Display
LED = Light Emitting Diode
CRT = Cathode Ray Tube
Extra Knowledge:
Organic light-emitting diode (OLED) monitors provide higher contrast, better
color reproduction and viewing angles than LCDs but they require more power.
A computer monitor is an output device that displays information in pictorial form. The
display device in modern monitors is typically a thin film transistor liquid crystal display
(TFT-LCD) with LED backlighting having replaced cold-cathode fluorescent lamp (CCFL)
backlighting. Previous monitors used a cathode ray tube (CRT).

3. This is a Desktop or full-size Computer Keyboard
Keyboards on laptops and notebook computers usually have a reduced
set of keys. They may not have a numeric keypad, and the function keys
may be placed in locations that differ from their placement on a
standard, full-sized keyboard. This is a laptop-size Computer Keyboard

4. Wired Keyboard
Wireless Keyboard
Wired Mouse
Wireless Mouse

5. OMR Scanner
OMR = Optical Mark Recognition Reader
Some Images of different types of scanner.
Scanner is a INPUT device.

6. Printers
Dot Matrix Printer
Dot matrix printing, sometimes called impact matrix printing
Daisy wheel