Bandwidth
Bandwidth commonly refers to:

Bandwidth (signal processing) or analog bandwidth, frequency bandwidth, or radio bandwidth, a measure of the width of a frequency range
Bandwidth (computing), the rate of data transfer, bit rate or throughput
Spectral linewidth, the width of an atomic or molecular spectral lineBandwidth may also refer to:

Science and technology
Bandwidth (linear algebra), the width of the non-zero terms around the diagonal of a matrix
Kernel density estimation, the width of the convolution kernel used in statistics
Graph bandwidth, in graph theory
Coherence bandwidth, a frequency range over which a channel can be considered "flat"
Power bandwidth, a frequency range for which power output of an amplifier exceeds a given fraction of full rated power

Other uses
Bandwidth (company), an American communications provider
Bandwidth (radio program), a Canadian radio program
Bandwidth, a normative expected range of linguistic behavior in language expectancy theory
Bandwidth, the resources needed to complete a task or project in business jargon; see List of buzzwords

See also
Bit rate, in telecommunications and computing