Final answer:
Common ground refers to shared information in a conversation that allows for coherent communication. It is the aggregate views of the public that they express openly.
Step-by-step explanation:
Common ground refers to the information that is shared by people who engage in conversation. It allows for communication between speaker and listener to make coherent sense to both parties. It is the aggregate views of the public that they are willing to express openly. Common ground is important in establishing understanding and agreement in conversations.