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An amplifier can be described as an electronic device that increases the voltage, current, or power of a signal ..
A driver amplifier will directly drive a load (RF antenna, servo motor etc. etc.) or will be used as a driver for another power amplifier in order to increase output power ..
In the common terminology, "amplifier" will be in many cases associated with a small signal amplifier, whereas "driver amplifier" will be used to describe some sort of power amplifier ..
Analog signal processing: match impedances for signal, signal transfer function (all combinations of current,voltage)
Digital: match impedances for fan-in, fan-out signal, realize logic operation
Power Electronics: match impedances for max power transference, power gain, distortion.
Driver supplies signal, power to the load like our fulfillments, maybe: low resistive loads for voltage signal, reactive loads (when anything switchs is necessary higher signals), ...
In RF electronics, VLSI what matters?
RF there is always power no signal anymore, Distributed models and about systems: stability, linearity; Noise
VLSI there are transients due to impedance mismatch for step response or frequency response like RF.
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