Anything related to the measurement of the frequency of periodic signals, i.e. the rate at which their waveform repeats along the time axis. The S.I. unit for frequency is **hertz [Hz]**.
Anything related to the measurement of the frequency of periodic signals, i.e. the rate at which their waveform repeats along the time axis. The S.I. unit for frequency is hertz [Hz] and it is equivalent to \$ [s^{-1}] \$ since it represents how many times in a second the waveform repeats itself.
See also Wikipedia on the meaning of frequency.
