An amplifier is an electronic device or circuit designed to increase the strength of electrical signals, making them suitable for further processing, measurement, or control. In industrial and automation systems, amplifiers are commonly used to boost weak sensor outputs, such as those from RTDs, thermocouples, or strain gauges, and convert them into standardized signals like 0–10V or 4–20mA. Amplifiers play a crucial role in ensuring signal accuracy, noise reduction, and long-distance transmission, especially in environments with electrical interference or complex control systems. They are also essential in process automation, instrumentation, data acquisition, and machine feedback loops.