feedback

/ˈfiːdbæk/
noun
  1. Opinions or information about how well someone or something is doing, used to improve performance.
    • The teacher gave me helpful feedback on my essay.
    • His manager provided constructive feedback during the review.
    • We asked customers for feedback about the new product.
  2. A high-pitched noise caused by a microphone or speaker picking up its own sound.
    • We had to adjust the speakers to stop the feedback.
    • Feedback from the amplifier ruined the recording.
    • The microphone made a loud feedback sound during the concert.
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