Bandwidth has several related meanings: 1  Bandwidth (signal processing) or analog bandwidth, frequency bandwidth or radio bandwidth: a measure of the width of a range of frequencies, measured in hertz.2  Bandwidth (computing) , the rate of data transfer, bit rate or throughput, measured in bits per second (bit/s). Bandwidth (linear algebra) , the width of the non-zero terms around the diagonal of a matrix. 2  In statistics kernel density estimation, bandwidth describes the width of the convolution kernel used.