Broadband (English: broadband) in basic electronics and electronic communication describes the frequency range that signals or electronic circuits contain or can be processed at the same time.

Broadband is a relative description. The larger the frequency range, that is, the higher the bandwidth, the more data can be sent. For example, in radio communication, signals with narrow frequency range can only send Morse code, and it takes a lot of bandwidth to send high-quality music.

The broadband of TV antenna means that it can receive a large number of channels. In data transmission, telephone lines are also used as signal transmission media, and optical cables are becoming more and more popular. Modems can only transmit data at 64Kbps per second, and broadband ADSL and optical fiber modems can provide higher transmission rates.