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I have to disagree. Servos are driven by a PWM signal, since the information is encoded by Modulating the Pulse Width, hence Pulse Width Modulation, PWM. It is different from PWM used in, for example, switched power supplies, but it is still PWM.
PPM stands for Pulse Position Modulation. The pulses in PPM have constant width and the information is encoded by changing the distance between them. Moreover, PWM is used to transmit information only about 1 channel, while PPM usually carries values for multiple channels. I recommend looking at this: https://en.wikipedia.org/wiki/Servo_control