(Latin: finger, toe; from Greek daktylos)
2. A device that converts an analog signal into a digital representation of the analog signal.
encodes each sample into a numeric representation of the amplitude value of the sample.
3. A device that converts the position of a point on a surface into digital coordinate data.
4. To manipulate or treat in some way with the fingers: to finger; to point at or count with the fingers.
An analog or analogue signal is any variable signal continuous in both time and amplitude. It differs from a digital signal in that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical context, however mechanical, pneumatic, hydraulic, and other systems may also use analog signals.
The word "analog" implies an analogy between cause and effect, voltage in and voltage out, current in and current out, sound in and frequency out.