The Fourier transform of a function of time is a complex-valued function of frequency, whose complex modulus of the Fourier transform represents the amount of that frequency present in the original function, and whose complex argument is the phase offset of that frequency.
The Fourier transform of a function of time is a complex-valued function of frequency, whose complex modulus of the Fourier transform represents the amount of that frequency present in the original function, and whose complex argument is the phase. This phase is offset of that frequency.