The content of communication is b. messageThe content of communication is the message because it is the main idea or information being shared between people. Without the message, communication would have no purpose, since it is the message that tells us what the sender wants to express—whether it is a thought, feeling, instruction, or piece of information. For example, when a teacher explains a lesson, the words and explanations form the message that the students need to understand. In other words, the message is the “what” of communication, while the other elements like the sender, channel, and receiver only help deliver and interpret it. This makes the message the core content of communication.