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en.wikipedia.org/wiki/Buffer_amplifier

A buffer amplifier (sometimes simply called a buffer) is one that provides electrical impedance transformation from one circuit to another, with the aim of preventing the signal source from being affected by whatever currents (or voltages, for a current buffer) that the load may produce. The signal is 'buffered from' load currents. Two main types of buffer exist: the voltage buffer and the...

www3.nd.edu/~lemmon/courses/ee224/web-manual/web-manual/...

What is a buffering circuit? Op-amps have a variety of uses. One use is as a so-called buffer. ... The output voltage from the buffer is insensitive to the load resistance because the idealized buffer has an output resistance that is essentially zero. By placing a unity gain buffer between the DAC and the load, we have, therefore, solved our ...

www.quora.com/What-is-the-use-of-buffer-circuit

The primary objective of buffer circuit is to boost the current in any circuit at any stage. Buffer circuits are mainly used where a signal has very low current input which needs to be increased maintaining the same voltage levels. So, this buffer circuits draws current from power source and adds it to the signal.

So it functions very well as a buffer. This circuit can be added to voltage line that needs to be buffered, which allows all the voltage to be transferred over, while giving out a low impedance output so that a load can be powered. Know that this is a basic buffer circuit. It isn't as accurate as an actual buffer chip.

www.circuitstoday.com/current-amplifier-and-buffers

Is buffer kind of circuit connect between two circuits to lower or up the value of current or voltage in order the second circuit work properly according to its own current or voltage value. My question is, why we need buffer, can we design first circuit correspond the voltage or current values of second circuit.

www.eecs.tufts.edu/~dsculley/tutorial/opamps/opamps5.html

The buffer has an output that exactly mirrors the input (assuming it's within range of the voltage rails), so it looks kind of useless at first. However, the buffer is an extremely useful circuit, since it helps to solve many impedance issues. The input impedance of the op-amp buffer is very high: close to infinity.

en.wikipedia.org/wiki/Digital_buffer

A digital buffer (or a voltage buffer) is an electronic circuit element that is used to isolate the input from the output, providing either no voltage or a voltage that is same as the input voltage. It draws very little current and will not disturb the original circuit.

circuitdigest.com/electronic-circuits/voltage-follower...

Voltage Follower is simply a circuit in which output follows the input, means output voltage remains same as input voltage. It is also commonly known as Unity gain Opamp Amplifier or Opamp Buffer.Here we construct a voltage follower using Opamp LM741 and see how its output follows the input. We already discussed about it in our Non-inverting Operational Amplifier tutorial, here we will build ...