What is bandwidth ? How is it measured ?

Bandwidth refers to the width of allocated band of frequencies to a channel. It is the difference between the highest and lowest frequencies of a transmission channel. Bandwidth is directly proportional to the amount of data transmitted or received per unit time.

In digital systems, bandwidth is data speed in bits per second (bps), bytes per second (Bps), mega bytes per second (MBps).

In analog systems, bandwidth is measured in cycles per second — kilohertz (kHz), megahertz (mHz), gigahertz (GHz) and terahertz (THz).