Signal amplifiers are electronic devices that increase the strength of signals, making them easier to transmit over long distances. They are commonly used in various applications, such as telecommunications, broadcasting, and audio systems, to ensure clear and reliable communication. These amplifiers work by taking a weak input signal and boosting its power without altering the original information. This process helps to overcome losses that occur during transmission, allowing for better quality and range. Signal amplifiers are essential in maintaining the integrity of signals in both wired and wireless systems.