Final answer:
Feedback is the term for obtaining information about the effectiveness of a message or interaction.
Step-by-step explanation:
The term for the process of obtaining information about the effectiveness of a message or interaction is feedback. Feedback is crucial in communication as it helps the sender of the message understand how well their message was received and whether it achieved the desired outcome. For example, in public speaking, feedback can come from the audience through their reactions, facial expressions, or questions.