The
 term 'feedback' means the return of the result or response of a 
particular communication from the receiver. Feedback is frequently used 
in communication to convey the repercussion of the receiver what he 
perceives from the message received earlier. So feedback is the return 
message or response from the receiver to the sender. It is a response 
from the receiver to the sender. It is a response from the receiver that
 informs the sender. It is a response from the receiver that informs the
 sender how the message is being interpreted and how the communication 
is received in general.
When a message is received, decoded and 
understood by the receiver, he is expected to show some response or 
reaction; he may take some action or reply or behave in a particular way
 as a result of message received. For completion of the communication 
process the communicator needs to know whether the receiver has 
responded in the desired way or not, he can find this out by getting 
feedback from the receiver. 
Thus feedback is knowledge of result of a particular communication; it can be used for modifying the future course of action relating to communication. No communication is complete without feedback. It completes the circle of two way communication.
When a message is received, decoded and 
understood by the receiver, he is expected to show some response or 
reaction; he may take some action or reply or behave in a particular way
 as a result of message received. For completion of the communication 
process the communicator needs to know whether the receiver has 
responded in the desired way or not, he can find this out by getting 
feedback from the receiver. Thus feedback is knowledge of result of a particular communication; it can be used for modifying the future course of action relating to communication. No communication is complete without feedback. It completes the circle of two way communication.