What do you call the response from the receiver to the sender's message?

The response from the receiver to the sender's message is called feedback. In communication, feedback is a critical component because it indicates how the message was received and understood. This can be in the form of verbal comments, non-verbal cues, or any other form of response that lets the sender know if their message was successful or if adjustments are needed.

Feedback helps to facilitate effective communication by providing valuable insights into the effectiveness of the message being sent. It allows the sender to gauge the recipient's reaction and adapt their communication style, content, or delivery accordingly. In many contexts, whether in marketing, education, or interpersonal communication, feedback is essential for improving future interactions and ensuring that the intended message is conveyed and understood. Other terms like output, input, and return do not specifically reference this unique aspect of the communication process. Output refers broadly to what is produced as a result of a process, input is the initial data or message sent, and return does not specifically denote the concept of response in a communication context.