The fundamental structure of every closed-loop system is the capacity of a control system to alter the inherent dynamics of a system, and in particular to stabilize it.
Open-loop control systems are just what they sound like—open ended non-feedback systems—in which the output quantity has no impact on the input to the control process.
The objective of any electrical or electronic control system, however, is to measure, monitor, and control a process. One way to accurately control a process is by keeping an eye on its output and "feeding" some of it back to compare the actual output with the desired output in order to reduce error and, if disturbed, return the system's output to the initial or desired response.
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