What does "READ BACK" indicate in radio communication?

In radio communication, "READ BACK" indicates that the operator should repeat all received instructions to confirm understanding and accuracy. This practice is crucial in ensuring that all parties have the same understanding of the information exchanged, particularly in situations where mistakes could have serious consequences. By repeating the instructions verbatim, operators can verify that what was understood aligns with what was originally communicated.

Summarizing the conversation or asking for clarifications serves different purposes—not necessarily confirming instructions. Ending transmission does not involve any acknowledgment or confirmation of previous communication and is unrelated to the concept of read back. Thus, the primary focus of a "READ BACK" is on ensuring clarity and reducing the potential for miscommunication by encouraging the receiver to replicate the exact instructions provided.