Feedback

Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop. The system can then be said to ''feed back'' into itself. The notion of cause-and-effect has to be handled carefully when applied to feedback systems:

|author=Karl Johan Åström and Richard M.Murray|title=''Feedback Systems: An Introduction for Scientists and Engineers''}} Provided by Wikipedia