feedback

/ˈfiːdˌbæk/

• Noun
• helpful information or criticism that is given to someone to say what can be done to improve a performance, product, etc.
1. The company uses customer feedback to improve its products.
2. He asked for some feedback from his boss.
• something (such as information or electricity) that is returned to a machine, system, or process
1. The computer makes adjustments based on feedback from the sensors.
• an annoying and unwanted sound caused by signals being returned to an electronic sound system
1. We were getting some feedback from the microphone.