What does "STANDBY" communicate to the sender?

The term "STANDBY" signifies to the sender that the operator is currently busy or preoccupied but will respond shortly. This communication is essential in radio operations because it informs the sender that their message has been received, but the operator cannot address it immediately. It assures the sender that they should hold their position and wait for a response without needing to repeat their message or take further action. This helps to maintain clarity and order in radio communication, especially in busy environments where multiple exchanges are occurring simultaneously.