Digital vs Analog Signals MS-PS4-3
NGSS

A continuous signal whose properties, like amplitude and frequency, vary smoothly
Analog signal
A continuous signal whose properties, like amplitude and frequency, vary smoothly analog signal. Analog signals are smooth and continuous waves used to represent information, unlike digital signals, which use discrete onoff pulses.

A series of electrical pulses that represents the digits of binary numbers
Digital signal
A series of electrical pulses that represents the digits of binary numbers. Digital signal. In simple terms, a digital signal uses a series of onoff states to send information, like how computers read and interpret data.