An Instrumentation amplifier is a kind of differential amplifier with additional input buffer stages. The addition of input buffer stages makes it easy to match (impedance matching) the amplifier with the preceding stage. In other words, we can say that the
Amplification It is an operation of an amplifier intended to make a signal stronger by increasing the power of a signal. The amplifier output matches the input signal shape but with a larger amplitude. It may be Linear or nonlinear.