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In computer networking and computer science, bandwidth,network bandwidth, data bandwidth, or digital bandwidth is a measurement of bit-rate of available or consumed data communication resources expressed in bits per second or multiples of it (bit/s, kbit/s, Mbit/s, Gbit/s, etc.).
Note that in textbooks on signal processing, wireless communications, modem data transmission, digital communications, electronics, etc., the word 'bandwidth' is used to refer to analog signal bandwidth measured in hertz. The connection is that according to Hartley's law, the digital data rate limit (or channel capacity) of a physical communication link is proportional to its bandwidth in hertz.

http://en.wikipedia.org/wiki/Bandwidth_(computing)