Every computer must have a display terminal called Visual Display Terminal (VDT) or Visual Display Unit (VDU). Instant reference of hardware and software level interpretation is displayed on the monitor. This is basically Cathode Ray Tube (CRT). The information regarding bits (0s and 1s) are displayed on the monitor in character form which we see as alphanumeric characters. Only the characters can be seen on the screen. Each screen has very tiny blinking materials caused to appear by electric current called pixel. The higher the number of pixels on the screen, (it is assumed that) the higher is the resolution or better is the character display or graphics display.
Cathode Ray Tube (CRT) or Visual Display Unit (VDU) has, usually 24 lines or rows and 80 columns. Different types of monitors are listed below:
MDA - Monochrome Display Adapter (one colour B/W)
CGA - Coloured Graphics Adapter (colour Red Green Blue)
MCGA - Multi-Colour Graphics Adapter
EGA - Enhanced Graphics Adapter
VGA - Video Graphics Array
SVGA - Super Video Graphics Array
LCD - Liquid Crystal Display
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