It is determined by the bandwidth, the rate of broadband is not the same as the decision of the difference between broadband, broadband and narrowband is relative, 56kbps MODEM dial-up Internet is narrowband, because 56kbps MODEM's theoretical channel bandwidth of 56kbps, converted into byte traffic, the theoretical transmission capacity is 56k/8 = 7k / sec. And this speed can only meet the transmission of a small amount of text information, for a large amount of data video, audio, graphic information, but is unable to carry.

In order to solve the problem of transmitting large amounts of data over the Internet, network operators have developed ADSL data communication services and other high-bandwidth data transmission services to meet the needs of people for the transmission of audio, video, and graphic information. Usually we call bandwidth above 1Mbps (1024M baud rate) as broadband