Instrumentation amplifiers are differential amplifiers that have been optimized for use with DC signals.

Instrumentation amplifier chips are precision amplifier circuits with both high-impedance differential inputs and high common-mode rejection

Power operational amplifiers (POA) are used to increase the power of low-level signals in applications that drive low impedances or reactive loads.

Signal amplifiers accept signals from sensors and other devices and amplify them to levels suitable for further processing or digitization by computer elements

Signal conditioning products provide amplification, filtering, converting, and other processes required to make sensor output suitable for reading by computer boards.

Operational amplifiers (op amps, op-amps) are general-purpose, closed-loop devices that are used to implement linear functions

Buffer amplifiers have unity gain.