The maximum amount of data that a connection can transmit in a given period of time, generally measured as bits per second (bps). A digital telephone line has a bandwidth of 64,000 bits per second (64 kbps). An analogue telephone line has a bandwidth equivalent to 9600 bps. However, the effective bandwidth of an analogue line can be increased by the attachment of a modem employing data compression. Also, the term is applied to part of the frequency spectrum; that part of the spectrum required for a specific purpose. The greater the bandwidth, the more information that can be sent through: e.g., a television channel occupies a bandwidth of up to 8 Megahertz, (Mhz), whereas a telephone conversation utilises only 4 kilohertz (kHz).
From: Communications

The capacity of the transmission medium stated in bits per second or as a frequency. The bandwidth of optical fiber is in the gigabit or billion bits per second range, while ethernet coaxial cable is in the megabit or million bits per second range.
From: Information Technology

The maximum amount of data that a connection can transmit in a given period of time, generally measured as bits per second (bit/s). A digital telephone line has a bandwidth of 64,000 bits per second (64 kbit/s). An analogue telephone line has a bandwidth equivalent to 9600 bits per second. However, the effective bandwidth of an analogue line can be increased by the attachment of a modem employing data compression. Also, the term is applied to part of the frequency spectrum; that part of the spectrum required for a specific purpose. The greater the bandwidth, the more information that can be sent through: e.g., a television channel occupies a bandwidth of up to 8 Megahertz, (Mhz), whereas a telephone conversation utilises only 4 kilohertz (kHz).
From: Internet

The amount of data a network can transport in a given period of time. Higher bandwidth means more data per second can be transferred.
From: Technology