Teacher's name: Zhang San.

Teaching course: online business planning

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Feedback, also known as feedback, is one of the basic concepts of modern science and technology. Generally speaking, the feedback concept in cybernetics refers to the process of feeding back the output of the system to the input end and changing the input in some way, thus affecting the function of the system, that is, the process of feeding back the output to the input end through appropriate detection devices and comparing it with the input amount. Feedback can be divided into negative feedback and positive feedback. In other disciplines, the word feedback has also been given other meanings, such as feedback in communication, feedback in radio engineering technology and so on.