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One aspect of buffer action is transformation of impedances.
For example, the Thévenin resistance of a combination of a voltage follower driven by a voltage source with high Thevenin resistance is reduced to only the output resistance of the voltage follower, a small resistance.
That resistance reduction makes the combination a more ideal voltage source.
Conversely, a voltage follower inserted between a small load resistance and a driving stage presents a large load to the driving stage, an advantage in coupling a voltage signal to a small load.

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