Bandwidth is a key concept in a lot of applications.
 In radio communications, for example, bandwidth is the range of frequencies engaged by a modulated carrier wave, whereas in optics it is the width of an individual spectral line or the whole spectral range.
There is no single universal accurate definition of bandwidth, as it is vaguely understood to be a measure of how wide a function is in the occurrence domain.
 For different applications there are different precise definitions. For example, one definition of bandwidth could be the range of frequencies further than which the frequency function is zero. This would keep up a correspondence to the mathematical notion of the support of a function (i.e., the total "length" of values for which the function is nonzero). Another characterization might not be so strict and ignore the frequencies where the frequency function is little. Small could mean less than 3 dB below (i.e., less than half of) the maximum value or it might mean below a certain absolute value. As with any definition of the breadth of a function, there are many definitions available, which are suitable for diverse applications.
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Network Bandwith