Bandwidth is the amount of data that can be transferred over the network in a fixed amount of time. On the Internet , it is usually measured in bits-per-second (bps).

A 56K modem transfers data up to 53Kbps, or 53,000 bits-per-second. a T1 line is about 1.5 Mbps. Bandwidth is also sometimes used in place of "data transfer" , which is wrong .