Feedback in control systems extends beyond error reduction, impacting aspects like stability, bandwidth, gain, impedance, and sensitivity. The significant effects of feedback can be understood in a basic feedback system with defined input, output, error, and feedback signals. Feedback impacts the gain of a non-feedback system by a factor of one plus GH. Feedback might amplify gain in one frequency range while reducing it in another. Stability refers to a system's ability to follow an input command effectively. An unstable system has an uncontrollable output. Feedback can destabilize an initially stable system, especially if GH equals negative one, resulting in infinite output for any finite input. Feedback can also bring stability to an unstable system. Introducing another feedback loop through a negative feedback gain can stabilize the system. In a system subjected to extraneous signals, feedback plays a crucial role in minimizing the effect of these disturbances. By introducing feedback, the noise component is reduced if the factor in the denominator is greater than unity and the system remains stable.