Explain about bandwidth with its unit.

Bandwidth is the maximum data transfer rate of a network or internet connection. It measures how much data can be sent over a specific connection in a given amount of time.

Mathematically, 

Bandwidth=Maximum data transfer / time taken

Bandwidth is expressed in bits per second (bps) or bytes per second in digital devices where as cycles per second or Hertz in analog devices. Similarly commonly used larger units for Bandwidth in digital devices are kilo bits per second (kbps), mega bits per second (Mbps) and Giga bits per second (Gbps).

Note: Bandwidth is often mistaken for internet speed when it's actually the volume of information that can be sent over a connection in a measured amount of time calculated in megabits per second (Mbps).

For more differences between Bandwidth and internet speed,

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Differences between Bandwidth and Internet Speed