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Most often, the unqualified term Fourier transform refers to the transform of functions of a continuous real argument, such as time ().   The amplitude and phase of a sinusoidal component of function s(t) depends on the component's frequency.  In terms of ordinary frequency (), it is the complex number:

Evaluating this quantity for all values of  produces the frequency-domain function.

Also see How it works, below.  And see Continuous Fourier transform for even more information, including: