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Phase Modulation is analog signal (carrier) transformation type when the signal changing parameter is its phase.
Maximum modulated signal phase deviation to the average value is called phase deviation able to be set in angular units (degree, radian)
According to its specifications phase modulation is similar to frequency modulation. In case of sinusoidal modulating (information) signal the frequency and phase modulation results are coincided. In analog technology phase modulation use is more rare than frequency modulation due to its requirement for more difficult transformation at receive.
The example of phase modulation is shown in the animated picture below: