Question

what is the significance of : 1) 19" 2) 1600* 900 in computers

Answer 1

Monitors and screens are measured in inches.

Therefore the 19” is actually 19 inches which is the width of a Monitor Screen measured diagonally.

The 1600* 900 is actually the resolution of the screen in pixels (picture elements), which means that the screen has the dimensions of 1600 pixels in breadth versus 900 pixels in height.