Fourier transform is the transform Domain signal into a Frequency analysis or to use guys deal with the signal frequency, such as commercially available filtering only the desired frequency range.
Fourier transform is converting the signal in the Frequency Domain analysis, or it is used to handle signals such as frequency signals in the frequency range desired.
Fourier transform is signal conversion in Frequency Domain. Used to analysis or deal with the signal in the frequency. Such as filter only the desired frequency range.